Final answer:
All of the listed violations at railroad crossings can lead to the loss of a CDL for at least 60 days. The correct answer is option D).
Step-by-step explanation:
Violations at railroad crossings that can lead to the loss of your CDL (Commercial Driver's License) for at least 60 days include: stopping too close to the tracks, failing to stop before reaching the crossing when required, and failing to slow down and check that the tracks are clear of an approaching train.
The correct answer to which violation can lead to such a suspension is D) All of the above. Each one of these violations is considered a serious traffic violation, and they reflect a disregard for safety procedures at railroad crossings which are put in place to protect both the commercial driver and the public.
It is important for commercial drivers to follow all traffic laws and regulations, especially at railroad crossings, to ensure their safety and the safety of others on the road.