I seem to have about the same harassment level on my bike as I do on foot. The odd male idiot screaming something, the occasional honk to make me jump. I'd estimate the numbers as less than one incident of harassment per day, vs 3-5 traffic violations per day. I wear street clothes (jeans, khakis, lightweight cotton tops) for both activities. Usually my top is a bright color - pink, red, or bright blue.

In LA there was definitely a class element to the harassment... black and Hispanic men in cars would be a *lot* more comfortable yelling at me. In an Angeleno's mind, only poor people walk. If you're in a car you have more money than the person who walks. I haven't noticed anything quite so obvious here in Madison.

In general tho I class the harassment I receive on the streets as sexual harassment. I take a lot more **** when I'm wearing something a bit bare, even if it's hot and a bit bare is a good idea. If the comments are intelligible, they're sexual. Given that, I'd suspect the reduced harassment from the bright vests and jerseys is that men don't see them as sexy. They may see a construction worker style vest as "work clothes" too, for a double whammy of "not ok to harass this one".