well , such things are just unavoidable in a great metropolis like beijing . i think a still more desirable benefit is psychological . bicycling home after work can help release your stress . life in the offices is miserable . you just sit there in a daze , gazing at the monitor and dealing with files and documents . why don't you give a full play to your energy after work ? enjoy the speed on the road . just think , you are flashing past the poles with your own energy . how great !