It is illegal to spit from a car or bus, but perfectly fine to spit from a truck.

The Law Explained

An unusual piece of local traffic and health legislation makes a strange distinction based on the type of vehicle you are in. Spitting out the window of a passenger car or a city bus is a punishable offense. However, commercial truck drivers and farmers in pickup trucks were seemingly given a pass, likely due to the lobbying of agricultural workers at the time.