To everything there is a season
And the season at hand is winter! :eek2:
Middle name is Murphy here. I am just beginning my solo career and have absolute no experience/perspective of driving in snow other than in a four wheeler. I have a pocket or two full of common sense, but any advice to drawn on while I am gaining experience would greatly be appreciated. :bow: Thank you in advance. :thumbsup: |
OK I'll start. Don't run your defroster when its snowing. The hot air on the windshield melts the snow but the cold air outside refreezes it to your wipers which is why they get caked with ice and won't work. Run the heat thru the floor and your windows should stay clear and your wipers won't freeze.:thumbsup:
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Well, when things get bad, i prefer to pull off if I have any doubts in my ability to keep things under control. Often, when things start to get slick, I feel comfortable slowing down and staying on the road. Other times, especially when wind is involved, I just don't think it's worth the risk.
Whatever you do, DON'T EVER let other drivers, be it 4-wheeler or otherwise, try and intimidate you into driving "their" speed. You drive ONLY as fast as YOU feel comfy doing; they'll just have to wait. Remember, THEY aren't going to be paying the bills if you pile your truck up. Furthermore, they won't pay the medical bills for you or anyone unfortunate enough to be involved in an accident, nor will they likely employ you if you lose your job due to said accident. Somewhere along this thread, I think someone will come on to try and tell you not to set your trailer brakes... ;) |
Not having much experience myself the only advice I can offer is to ask for runs going south. ;)
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Ice is the real problem. Black ice especially since you can't see it. You have no control of the truck on ice and you need to find a safe place to stop until the conditins improve. When the weather is shitty I keep my CB on because Ch. 19 will keep you posted pretty well about road conditions. Make sure you keep your windshield washer fluid full. You will need it when deicers take effect and turn everything into a mushy, filthy slurry! :D Also make sure your wipers are in top condition. |
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I have a friend who went through orientation here at Con-way truckload back at the beginning of October. He was fired before the end of the month, due to a single vehicle jackknife...never hit a thing, but tore the trailer in half, and heavily damaged his tractor. He did this with a 44,000 lb load. http://i195.photobucket.com/albums/z...6/DSCN2443.jpg http://i195.photobucket.com/albums/z...DSCN2438-1.jpg |
I know that'd I'd rather come across I-68 with a heavy load than I would empty. If you lose traction when pulling a hill, you can get screwed really quick. If the weather is too bad (aka you don't feel comfortable driving in it), find a place to park.
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When the roads get bad, you may have to use the diff. lock to get going. Once your speed is up to between 5 and 10 mph, UNLOCK THEM. The "4-WHEEL-DRIVE" theory is fine for a 4-wheeler, but doesn't work as well with a combination vehicle. If you break traction with your drives, you have a much better chance of spinning all drives if you have them locked in. That will make the back of your tractor slide sideways and risk a jackknife. With them unlocked, you have a much better chance of spinning only one, and the rest just roll and keep you in line. Back off on the throttle, and then feather it enough to maintain your momentum. Absolutely, do not try to use an engine brake. But, when you approach a hill, try to have enough momentum at the bottom to be able to make it over the top. Many drivers spin out because they approach the hill too slow, then try to "power" it over the top. You want to incorporate "COAST" along with a feathered throttle to get over the top. If you apporach a hill at 35 mph, and slow down to 10 by the time you reach the top, that's fine. YOU MADE IT!!!
Ask Golfhobo about his run across I-40 to Amarillo, in December, a few years ago. I don't know what he was carrying, but I had a very light load, and there were drivers chaining up to run flat land. (I didn't have any trouble at all.) No sudden moves with the throttle, wheel, or the brakes. Drive like you have no brakes. That means a much greater stopping distance... And far more "SAFETY ZONE" in front of you. There's always a lot of talk about "BLACK ICE". I was once told that what makes black ice so bad is the fact that you can not tell if it's road surface or ice on top. I was also told that it does not include "WET ICE". Being from MN, I'm sure you've had the chance to step out of a car in the rain, and promptly slide under it. If you have to run through freezing rain, and a layer of water on top of the ice, feathering that throttle is far more important than any other time. And, choose a higher gear to reduce the torque of the engine and reduce your chances of breaking the drives loose. You'll also want to keep a check on your airlines under the trailer. A small hammer comes in handy to knock the ice off of them so that the weight does not drag them to the ground. You can rub a hole in them and be stuck with no way to release the trailer brakes. It requires a service truck to come and repair the lines. And, being from MN, I'm sure you are also aware (and many other drivers are not) that the closer to freezing the temp is, the more slick the snow cover can be. If you can pack a snowball, expect the snow covered road to be very slick. Also, under trees and overpasses, look for ice. Any area where the sunlight is blocked. The theory of keeping your windshield cold works only if the temp is below about 27 F. If it's snowing at 30 F, and it's a heavy, wet snow, it won't matter if you have your defroster on or not. |
This kind of info is what makes CAD.
You know I am printing all this great advice off and keeping it in my binder! :thumbsup: |
Keep your lights clean, not your head lights but your tail lights. Snow will build up and the entire back of your trailer will get covered making you virtually invisible to the guy behind you in a storm.
Those flexible air lines going to your trailer tandems can pick up a lot of snow, I check those everytime I stop. I try to kick off any snow I can actually, if I can kick off a big chunk then it can just as easily come off when I hit a bump which could be bad news for the guy behind. A couple of really good threads http://www.classadrivers.com/forum/n...need-some.html http://www.classadrivers.com/forum/n...r-driving.html |
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Of course any vehicle can lose traction but logic and the laws of physics tell me that a heavier vehicle will be more affixed to the ground than a much lighter one. |
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A major part of being a professional driver is KNOWING HOW YOUR EQUIPMENT WILL REACT TO VARYING CONDITIONS, and KNOWING THE LIMITS OF YOUR OWN ABILITY. One day in TX, on I-40, I counted more than 30 trucks off the road in a 36 mile stretch of hiway. That was from the NM line to Vega. And, there is one more thing about getting off the road. Before you start down a ramp (or up), make sure the way is clear. More than once, I've seen ramps blocked by rigs that jackknifed near the end, at the stop sign. If the way is blocked, and the ramp is that bad, you could join the other rig at the end. I've also seen one spun out on a ramp, and a second one tried to go around... And their trailers met. More than once, I've had to stay on the road because it was actually safer than taking an exit ramp. PA, some years ago, had a guy stationed at the enterance to the rest areas waving all traffic away, and someone on the CB saying that everything in the rest area was jackknifed. It's fine to say you're going to get off the hiway, but can you do so safely? If not, you're destined to keep going until you can. |
Keep a bunch of cans of de-icer in your truck. Try to keep 1 in the warmth of the driver compartment so the cold doesn't make the can lose pressure. This is the best stuff for de-icing glass, mirrors, and light. I don't climb up to remove ice from my windshield...ever :D
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Find an empty, snow covered paking lot and "try some stuff" to see what to expect when you get out of your "normal driving envelope". I have found it would take a LOT of stupidity on my part for things to get "out of hand". ...The same things that keep you safe in everyday driving {speed, distance, relative speed, ect} keep you safe in bad weather. Keep your 5th wheel well greased, so the trailer does not "steer the tractor". |
drive safe talk to drivers going the other way and no load is worth your life
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when you see yellow snow, it's best to go around it. :)
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I love lemon snow cones. |
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Never hit a thing...but his trailer,and destroyed over 100k in equipment . |
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Heavier gives better grip ,and if evenly loaded you stand less chance of sliding..But if you break traction heavier is harder to regain control of ... |
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Actually it's the same with both ,and it boils down to a wheel that has torque applied to it will break traction b4 a wheel that does'nt ,and that applies to any vehicle . |
heavy load is great in snow. that fella in the picture was out of control on black ice.
i have run in lots of snow and on uphills go 45-50 mph to keep up the momentum. i go down hill slower than most so if trailer tries to come around i can accelerate and straighten it up with out gaining too much momentum going downhill. it takes me too long to do that full chain thing. i wont be without raingear. rubber or snow boots, rubber gloves and a good lantern.its just too miserable chaining when your wet and cold and your in the way you get some lousy trips if you park that load and your co-workers run those chains for 5 miles and deliver on time |
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A couple of years ago, when PA had most everything shut down, I made the trip from FL to Boston ON TIME. The return trip was also ON TIME. Care to take a guess on just how long it took me to get runs away from the east coast, and out to the mid-west where I much rather run? Come to think of it, that was also the run that I got there and was told I don't have an appointment. I had to have dispatch make a real appointment for me for the following day, and I asked dispatch just who was responsible for the 22 HOURS OF DETENTION TIME on that run. Wonder if that's why they ran me east so much after that? |
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If you have the differentials locked in, your chances of spinning out with all drives is far greater, and when that happens, gravity will pull the drives toward the lower side of the highway. It's far more difficult for you to try to keep tractor and trailer in line. I've talked to a number of drivers that have jackknifed, and in most cases, they could not understand how it happened. "I even had the differentials locked in to give me more traction, and it still went." To get started, the differential lock is an asset. Once you are rolling, it becomes a liability. There's a good chance that if they had not locked them in, they would not have jackknifed. If any of you ever have the chance, try it out on a skid-pad and see just what the effect is. But, make sure it's a skid-pad with a crown to it like the crown on the road. |
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Like I said a wheel with torque will spin b4 a wheel without...now a drive wheel will break loose when you put more twist to it than you have traction which is hader to do with 2 live axles than 1 since the torque is now applied to 2 drive wheels not 1 , But if you use 2 much skinny pedal you are now breaking loose 2 tires not 1...and 4 if you have a locking differential ...NON OPEN CARRIER...as both drive shafts will receive equal torque regardless of what wheel has most traction unlike open where the wheel with the least traction get the torque ,as energy always follows the path of least resistance ... So if you srew up with diffs locked it's worse b/c you break loose more rubber,and if you spin a tire loose it loses traction in every direction so you will slide to the down hill side of the road ,because it's the path with least resistance...Until you find a few large trees . |
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Use your time wisely and watch the weather closely. This is where an air card (or new generation phone)can become priceless. Weather forecasting isn't all that different today than it was 20 years ago . . you get some "reader" reading the same forecast over and over again even while you're watching the weather change before your eyes. An air card gives you realtime access to numerous sources and images. For instance, the WADOT site offers real time chain status and traffic cams for all the mountain passes. If it's currently clear and you have the choice of spending the night on this side or the other, run like hell to get to the other.
Slow and steady wins the race, said the tortoise to the hare. If you find yourself on a rotten roadway, don't be afraid of it . . manage it. On a narrow two lane posted 35, you might set a target speed of 25, which, depending on your truck is probably the high side of 5th or the low side of 6th. In any event, you want to "gear" yourself so you can add or reduce your speed by 5 mph without shifting or braking. Accelerate a little as things look better, back off a little at the first sign of trouble. Add a little speed as you approach an upgrade and back off a little as you approach a downgrade. You'll be in a better position to downshift if you find you need to do so quickly. Always be prepared to stop. Probably one of the hardest things to do on any slick road is to watch the super truckers and 4x4 4 wheelers blow by you because they somehow got it in their heads that they won't have to stop. They are wrong. Sooner or later, everyone will have to stop. If you're approaching congestion, an intersection, ramps, rest areas you have to anticipate and assume someone is going to do something foolish and you have to be prepared to stop. Be prepared to stop for awhile. Keep plenty of extra food that doesn't require any preparation. Keep plenty of extra water. Keep plenty of extra warm clothing and bedding. Stay with your truck . . it'll be a lot easier to find than little bitty you. Stay ahead of your fuel. When in doubt, ask for more. If you can avoid trouble by getting off your fuel route, by all means do so as long as you're sure you're not jumping out of the frying pan and into the fire. If you do find yourself in need of assistance, wave your VS foundations aggressively to attract attention. |
Some one needs to photoshop a swift logo on that truck an trailer .
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" Care to take a guess on just how long it took me to get runs away from the east coast, and out to the mid-west where I much rather run?"
yea, we got a driver thats good buddies with the dispatch boss and i done lot of chaining cuz he whines so much. and he got the new equipment it also sucks when you chain up and your coworker gets through barefoot and they want to know what took so long |
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YankeeTURBO said:
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Try "hill climbing" in a two wheel drive vehicle vs. a 4 wheel drive. No matter how much momentum you have, you will never make it to the top without applying torque to EVERY drive wheel you have. I fail to see how the theory of all wheel drive would apply to 4wheelers but not combination vehicles. Quote:
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Dry snow requires "packing" to make it icy. Wet snow will ice up due to "freezing" the moisture contained therein. I would rather drive in a foot of Western snow than an inch of Eastern snow. What someone said about paying attention to weather forecasts is right on! KNOW what you will find ahead of you. And KNOW whether it started as freezing rain or as a dry snow. One more thing. The Western and Northern slopes of any mountain is MORE LIKELY to have a lower temperature and therefore an unexpected snow. Just because you climbed UP a mountain in dry weather OR rain, does not mean that is what you will find once you crest the mountain! Anyone who has ever gone through the Eisenhower Tunnel going west from Denver knows exactly what I mean. |
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The simple truth is, an open differential sends EXACTLY EQUAL torque to both ends. This applies both if it's a differential within an axle, OR a differential BETWEEN two axles, aka inter-axle differential. When one wheel breaks traction and starts spinning, it is gripping the ground LESS than the other wheel(s) that is gripping. This means that it is now handling less torque, which in turn causes a torque reduction on the other side, which is why you almost never spin both wheel sets on an axle. any attempt to feed more power yields no gain, since attempting to increase torque only spins the spinning wheel faster, while not putting any MORE torque or power to the wheel that is not sliding. The same concept applies to an inter-axle differential. Same device, same effect, just a different application. This time, when the inter-axle is NOT locked, it acts as an open differential between the axles. Meaning if one wheel spins up on one axle, it will also limit the torque going to the OTHER axle, which means in practical terms, that one wheel will likely be the only one spinning. The APPLIED TORQUE is the SAME across all wheels, however since 3 are now gripping and can handle more, the one that CAN'T handle more, the spinning one, is the one limiting everything. All of this changes when you lock the inter-axle diff. This allows one axle to recieve MORE torque than another, in the event that a loss of traction occurs. For example, if one of your front wheels breaks traction, FULL POWER can still be applied to the rear axle, UNTIL a wheel set on the rear axle breaks traction, and thus, you end up with TWO spinning wheels. This is why people think that when the diff is locked, you are under TWO WHEEL DRIVE...which isn't the case. Each wheel is still having the EXACT SAME applied torque, and the exact same forward force acting on the truck...but ONLY as much as the slipping wheels! Windwalker nailed it right on the head, in regards to why you DON'T want the inter-axle diff locked in while moving down the road. When a wheel breaks traction, it can no longer control lateral movement, as the full effect of it's friction on the road has been spent trying to turn the wheel, leaving nothing to keep the rig straight. With the differential unlocked, you will likely have 3 other wheels that AREN'T sliding, and thus have some of their friction availible to keep you on the road. When the diff is locked, and traction is lost, you have AT LEAST two wheels spinning...which puts you at grave risk for a jackknife. Great post, windwalker...I probably just confused everyone...:lol: |
Not at all Tom! Great post! Some valuable and relevant infro from both you and WW. I think it may be time to pass the mantle back..............
As for Golfhobo? What can I say? Some things never change. |
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Just to clarify, that post was not intended as an affront to BJ...unlike a certain other thread...:whistle:
But it seems like it's almost come to be a commonly accepted principle that only ONE wheel is driving the vehicle at a time...which is far from the truth...and it's much easier to understand how a vehicle's going to react in less than ideal conditions if you understand the dynamics behind it...for those who care!:D On edit: Belpre, sent you a PM...not used to this forum software, didn't realized you replied until yesterday!:o |
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Check these quick videos: www.youtube.com/watch?v=q-rQTHMVAuw www.youtube.com/watch?v=y6_kOlUXYoI then go to this link. http://www.tpub.com/content/trucktra...283-10_110.htm But, before you leave it.... check the FIRST paragraph concerning use of the trolley brake to avoid jacknifing. This will vindicate my position in the "debate" with RockyMtnPro many years ago. Also, if you click BACK once or twice, you'll find interesting info on how to use the engine retarder on icy roads. [I am not advocating this. I just found it interesting.] I am not arguing with Tom. He does sound like he knows what he's talking about, and I have never claimed to... concerning this issue. I do recall that I was taught that there are different types of diff interlocks on trucks. I only know about the ones I've driven. Also, there may be a disconnect on what type of road conditions we are addressing. A solid sheet of ice may substantiate Tom's position. I am referring to roads with "patches" of ice, or "patches" of pavement, or even "patches" of sand or slag, where ONE tire may lose traction but others might NOT. There are all kinds of ways to find traction on snow covered roads. ONE is to move to the right and make use of the "growler." I am not driving YOUR truck, or Dobry's. I am driving mine. I have driven in snow for many years of my life. You guys can do whatever makes you feel comfortable. I was only relating MY experience and MY opinion. And unlike many who post here, I have never lost control of my truck, never hit anything, and never asked HOW to drive in snow. I almost didn't get into this thread, as I don't like telling someone else how to drive their truck. I drive my truck in a manner that I FEEL gives me the most control at the time. I have had 3 "close calls" while driving on slick roads. I came through all 3 with exactly the results I expected by employing the tactics I believed in. One involved running with the diffs locked, and two involved the trolley brake to straighten out my trailer (or to increase braking from the most rearward axle.) But, I am no expert. I'm just a driver. A professional driver, and a SAFE one. I know (or I think) you were just razzing me, Bel. And, I am NOT responding in anger or indignation. I'm just not using smilies. I thank Tom for his explanation. Yes, it confused me somewhat. So I went to Wiki for more info. I am still (somewhat) confused. I am not the most mechanical person in the world (but I AM capable of understanding theory.) Probably that low testosterone level that someone accused me of. :lol: But, I drive by "feeling" the road and my vehicle. And KNOWING the conditions I am in.... or may encounter. And I have every intention and belief that I will retire from trucking accident free. I hope the same for you and all my other "friends" here. |
Hobo,
I was just attempting to explain why it's easier to go sideways when more wheels break traction, that's all.:nana: Strangely enough, I agree with you on how you check the amount of control you have. No, I never have used the steering wheel, but I do every so often tap the brakes a little bit, just to get a feel for the level of traction availible to me. This is NOT something I'd recommend to someone who's not comfortable with the way their truck handles in snow, or someone who feels uncomfortable with doing it. It's the way I've always driven my car in snow, and it's something that subconciously carried over into this thing.;) From www.about.com: Differential: A special gearbox designed so that the torque fed into it is split and delivered to two outputs that can turn at different speeds. Differentials within axles are designed to split torque evenly |
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And yes.... there is a big difference between a "wet" or humid heat and a "dry" heat. I'll take 100 degrees in Arizona over 85 degrees in the Carolinas ANYTIME! And so will most people with Asthma or other similar conditions. Why do you think doctors recommend dryer climates for some people? All I am saying is that a driver should understand how weather and conditions are different in various parts of the country. You cannot expect the same conditions you are "used to" when you drive in a part of the country with which you are NOT. Here is an extra credit question for you. WHY is eastern snow wetter than western snow? And for that matter.... WHY is western heat dryer than eastern heat? |
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What do I win?:clap: |
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