The real Louisiana knowledge test is the DMV exam used for a learner permit. This page contains one fixed 20 question slice of the full free 180 question bank, with an explanation after each answer.
Sample question from test 7
safe-driving
What causes hydroplaning as speed rises on a wet roadway?
- The tires ride up on a layer of water and lose pavement contact
- The engine becomes flooded by rainwater
- The brakes lock because the road is too dry
- The steering wheel automatically turns toward the shoulder
Answer: The tires ride up on a layer of water and lose pavement contact. Hydroplaning begins when water cannot be removed from the roadway quickly enough by the tires. The tires then ride up on the water like skis, reducing or eliminating contact with the pavement. That loss of contact means the driver cannot rely on normal braking, acceleration, or steering. The explanation involving a flooded engine confuses a roadway traction problem with a mechanical problem. Reduce speed on wet roads, maintain recommended tire pressure, and keep usable tread so water can escape through the grooves.