Firstly, it is dangerous to pass a pedestrian's lane. In fact , walkers pay no attention toward bicycle and even there are people who spread to walk talking with friends or co-worker. The more it become dark , the more danger that is .
Secondly , it is also dangerous to pass a small line beside car lanes. Bicycle users usually don't put on a helmet , and cars pass by them at fust speed . Furthermore , car driver rather than avoid bicycle , so this situation provide them mutual problems .
In conclusion , the accidents which relate to bicycle seem to occur easily , so I think cities should build bicycle lanes .

