As a Pennsylvania driver, no one need tell you about the frustrations of sharing our mountainous roads and highways with 18-wheelers, especially when you get stuck behind one on an uphill grade and another one blocks your passing lane. Your natural tendency likely is to get around both of them at your very first opportunity and leave them receding in your rearview mirrors.
Before passing any semi, let alone two of them, on a downhill grade, however, you should know that the possibility of a jackknife increases dramatically under the following three conditions:
- Steep downhill grade
- Curve or turn
- Icy, snowy or wet road