Final answer:
The 'NO U-TURN' sign prohibits complete turns to reverse direction, maintaining traffic flow and safety. In high-speed areas, traffic signals help slow down vehicles, preventing accidents by controlling the intersection more effectively.
Step-by-step explanation:
The 'NO U-TURN' sign is a traffic control device used to inform drivers that making a complete turn to reverse direction is prohibited at that location.
This rule helps to maintain traffic flow and prevent accidents, especially where visibility or road design makes U-turns dangerous.
Instead of allowing for abrupt turns that could lead to collisions or congestion, traffic engineers design roadways and install signs and signals to manage vehicle movement efficiently and safely.
In areas where many vehicles speed through the intersection without adhering to the posted speed limit, the installation of a traffic signal could be beneficial.
A traffic signal compels drivers to slow down as they approach the intersection, reducing the likelihood of speed-related accidents.
Signals give explicit instructions to stop, slow down, or proceed with caution, thus preventing drivers from speeding through and ensuring a safer flow of traffic.