Final answer:
When turning into cross traffic, you should look left first and last because traffic from the left will reach you first and is the most immediate threat.
Step-by-step explanation:
When turning into cross traffic, it is important to look left first and last for safety reasons. Firstly, in countries where people drive on the right side of the road, the first lane of traffic you will encounter when turning is coming from your left. This traffic is the most immediate potential hazard and will reach you first, so you need to check for oncoming vehicles to avoid any collisions. After checking other directions, looking left again helps to ensure that no vehicles are quickly approaching before you make your turn.
Pedestrian safety is also a concern at intersections. A traffic signal in such scenarios allows people to cross at designated times rather than having to navigate between cars, reducing the risk of accidents. A signal also addresses issues such as vehicles speeding through the intersection by compelling them to slow down and abide by traffic rules.
Furthermore, implementing a traffic signal at an intersection can significantly reduce the number of accidents. The presence of a traffic light can aid in managing the flow of vehicles comprehensively, creating a much safer environment for both drivers and pedestrians.