What is the fine-grained topic of the following text: Turning to cycling, she indicated that traffic levels as low as 2000, 1500, or 1000 PCU per day were preferred to enable safe cycling (PCU – Passenger Car Unit ) This is on a par with Manual for Streets which cites 100 vehicles per hour peak flow as a threshold level below which pedestrians will share highway space with motorists, and above which they will tend to treat the general path taken by motor vehicles as a ‘road’ to be crossed rather than as a space to occupy. Only return the topic.
Safe cycling traffic levels