Drivers are supposed to share the road with cyclists, and one of the most crucial issues is when a car has to pass a bike. At a time like that, drivers must give cyclists enough of a buffer zone to prevent an accident.
Cyclists face a lot of risks on the road, especially when drivers do not respect them and take intentional actions to cause accidents or put them at risk. Drivers know that they're not very likely to get injured in a car vs. bike crash, and it makes them act aggressively and dangerously.
National Bike to Work Week ran from May 13 to May 17. While the goal of the week was to get people to consider spending more time on their bikes, promoting cycling and reducing the number of cars on the road in California, it also served another purpose: drawing attention to just how dangerous biking can be.