The speed limit sign on a dry, clear day shows the maximum speed. If heavy fog rolls in, you should:

• A.Keep driving exactly at the limit
• B.Speed up to get out of the fog sooner
• C.Use cruise control to hold the limit
• D.Drive well below the limit because conditions are no longer ideal

Why

Posted limits assume good visibility and dry pavement. In heavy fog you must slow well below the limit so you can stop within the distance you can actually see.

Manual topic: Texas Driver Handbook (DL-7) - Basic Speed Law · From the Texas Learner's Permit (Car) practice bank (TXC-040).

Practice the full Texas Learner's Permit (Car) test

More Speed Limits & Following Distance questions

• Unless a different speed is posted, what is the speed limit in an urban or residential district in Texas?
• Unless posted otherwise, numbered highways outside an urban district in Texas may have a speed limit up to:
• School zones in Texas typically have a speed limit of:
• In normal conditions, you should generally keep at least how much following distance behind the vehicle ahead?
• When following a motorcycle, the Texas handbook says to allow: