. . alerting motorists to the height of the underpass, the truck driver tried, unsuccessfully, to squeeze the 13-foot, 6-inch tractor-trailer beneath the 12-foot, 6-inch trestle, according to Police Chief John Saddic.
Truck fails to clear Route 420 bridge - The Delaware County Daily Times : Serving Delaware County, PA(DelcoTimes.com)
There is a lesson here for new Drivers:
While simply observing a warning sign is commendable, a little consideration to it's meaning and perhaps some analysis of potential consequences is also warranted. In this example, even if you're not particularly good with math, the yellow hashmarks overhead are a pretty good indication that there is potential for trouble overhead. Look around you. Of the many vehicles using the roadway, are there any vehicles present which may be more or less likely to encounter overhead problems?
HINT: Tall vehicles are much more likely to hit things that hang low over the roadway.
Extra Credit:
How fast was he going?
What was the distraction?
What time is it?