In truth, if you are the type messenger that is following traffic law, riding "correctly", being considerate of others you certainly will not be making a lot of runs quickly and probably won't be a messenger long. My understanding is that most messengers either age or nerve out, or get hurt bad enough that they can't. It is a dog eat dog type of business.
Have any of you actually paid attention to how the Amazon and FedEx drivers in your area act with a 2 ton van + parcels?