Final answer:
A line of sight search in driving refers to a driver's ability to see potential hazards on the road, and it should extend at least 12 seconds in front of the vehicle.
Step-by-step explanation:
In Physics, a line of sight search refers to the concept of a driver's ability to see and anticipate potential hazards on the road. The statement that the line of sight search should extend at least 12 seconds in front of the vehicle means that the driver should be able to see objects or obstacles at least 12 seconds ahead of their current position. This is important for safe driving as it allows the driver to react in time to any potential dangers ahead.