Should countries aim to implement a comprehensive helmet law, or is it more appropriate to phase in a law, in order to allow the traffic police to manage the new responsibility?
国家的目标是否应是实施一项综合头盔法或更适宜地分阶段实行法律,使交通警察能承担这项新的责任?
3
The extensive system has allowed the city to phase out much car traffic in its center, while preserving the efficient movement of people from the city center to outlying regions.