Final answer:
Warning signs that indicate changes in road surface or overhead clearance include slippery when wet, bumpy road, and low clearance signs.
Step-by-step explanation:
Other warning signs indicate changes in the condition of the road surface or overhead clearance. These include:
- Slippery when wet sign, which warns drivers that the road surface may be slippery when it's raining or snowing.
- Bumpy road sign, which indicates that there are irregularities on the road surface that may cause the ride to be bumpy.
- Low clearance sign, which lets drivers know that the overhead clearance is limited and they need to be cautious.