When driving a vehicle, does your ability to perceive road signs and signals improve with time?

In the photo, the driver's eyes are closed and his head is dropping onto his chest - this is what tiredness at the wheel looks like. The longer you drive, the worse you become at noticing signs and signals, not better. The answer is: no.

As driving time goes on, concentration drops, reaction time gets longer, your eyes start to "slide" over the surroundings, and the brain skips things it would normally notice. After a few hours of continuous driving, microsleeps lasting fractions of a second appear, during which you see nothing. That is why professional drivers have compulsory breaks, and everyone is advised to stop about every 2 hours. If you feel sleepy, the only effective cure is to stop and have a short sleep.