You may legally drive 10 mph over the speed limit:

1. At all times.
2. When passing another vehicle.
3. In light traffic conditions.
4. Under no circumstances. ✓

Answer: D. Under no circumstances.

You may never legally drive 10 mph over the speed limit in Florida — the answer is under no circumstances.

Why this is the answer

The handbook says posted speed limits show the fastest speed you may drive when conditions are good, and speeding is against the law. It addresses this exact idea directly: the "speeding buffer" is a myth. You are not allowed to drive up to 10 MPH over the limit, and you can get a citation for speeding. It also tells you to slow down below the posted limit when weather, roadway, or traffic conditions call for it, and to always keep enough control of the car to avoid collisions.

Why the other answers are wrong

• A. At all times. — The handbook says you must obey the speed limit, so going over it is not allowed at any time, let alone all the time.
• B. When passing another vehicle. — Nothing in the handbook gives you extra speed for passing; the limit applies the same whether or not you are overtaking another vehicle.
• C. In light traffic conditions. — Light traffic does not raise the limit — the handbook ties your speed to the posted limit plus weather, roadway, and traffic conditions, which can only call for driving slower.

Remember it

Think of the posted number as a ceiling, not a starting point — the 10 mph cushion people talk about does not exist on paper.