Why is it not advisable for Liz to run along busy streets?

Running along busy streets poses significant risks due to traffic, making it potentially dangerous for a runner. The presence of vehicles creates a hazardous environment where the likelihood of accidents is heightened. Drivers may not notice pedestrians or might not obey traffic signals, putting runners at risk of collisions.

When considering safety while exercising, the potential for injury from traffic-related incidents is a primary concern that outweighs other factors. Although crowding, pollution, and lack of amenities like water stations can impact a running experience, the immediate danger posed by moving vehicles is the most critical issue to address for personal safety. This makes it crucial for anyone considering outdoor running routes to prioritize areas with less traffic or designated pedestrian paths to ensure a safer exercise environment.