The traffic could be at a standstill and bikes will be be either filtering along the centre or swerving in and out between the lanes of traffic to progress forward. The best one is buses. They will be on your left at the bus stop and one fitters along the outside, gives the exhaust a blip before getting to the front of the bus and it warns people that are crossing in front of the bus that are just about to step out in your path as they can't see you. Give the horn a beep and it will get lost in all the other sounds or horns being beeped. People just ignore it a bit like a car alarm gong off. We are immune to them. Then there are coaches, bi lorries etc. Yes there are the exceptions with death people, 
Might as well be death, as people are like zombies sometimes. and this is one of the big concerns with electric vehicles. The same for the blind who totally rely on their hearing.(:-})
