Truckers' Challenge: How Well Do You Know Big Rigs?Share:FacebookPinterestTwitterMail12. What does a "low clearance" road sign mean for big rigs?48%Next Correct Incorrect It warns trucks about the maximum height allowed to avoid collisions with overhead structures. 12. What does a "low clearance" road sign mean for big rigs? No trucks allowed Maximum vehicle height limit Speed limit Stop required 48%
