Final answer:
Unsafe conditions such as narrow lanes, poor visibility, and lack of signage make road maneuvers like passing and left turns dangerous. Intersections without traffic signals pose risks as vehicles tend to speed through them, endangering pedestrians as well.
Step-by-step explanation:
The unsafe conditions in the roadway that make passing/overtaking and left turns at intersections unsafe include narrow lanes, poor visibility, and lack of signage. All of these factors contribute to an environment where it's difficult to judge the speed and distance of oncoming vehicles, complicating maneuvers like passing or turning. Narrow lanes can reduce the space available to maneuver safely, poor visibility may obscure oncoming traffic or pedestrians, and lack of signage can lead to confusion about the right-of-way and expected driving behaviors. Furthermore, intersections without traffic signals can be dangerous: vehicles may speed through them, disregarding the posted speed limit, and pedestrians may have to dodge traffic, leading to unsafe crossing conditions. The rise in the number of accidents, sometimes fatal, underlines the need for traffic control measures like signals to regulate vehicle and pedestrian movement.