Final answer:
Collisions involving pedestrians occur at intersections and crosswalks in business districts due to speeding vehicles, lack of pedestrian protections, and high traffic volume.
Step-by-step explanation:
Collisions involving pedestrians often occur at intersections and crosswalks in business districts due to several reasons. First, many vehicles speed through these areas without regard to the posted speed limit, making it difficult for pedestrians to safely cross.
Secondly, pedestrians often have to dodge traffic because there may not be designated crossing times or infrastructure in place to protect them. Finally, the high volume of both vehicle and pedestrian traffic in business districts increases the likelihood of accidents occurring.