If you start cycling, don't forget to keep running or start jumping - different muscles are involved. Practice of crashing (judo, aitrack) can't be underestimated.

The relative speed between vehicles it's what does matter - keep the flow (or between the waves), the distance and attention (doors, sideways, blind spots, bus stops), be obvious predictable, use your imagination (fly trajectory) and signaling - even take a middle of the road when needed to not confuse someone he can take a chance to overtake you at wrong moment.