The brake efficiency in the braking test is assumed as _______

If the side walk is 1.5m, then the capacity of pedestrians in one way is ______

The pollutant mostly released by automobiles is _______

Land use, transportation and road network plans are ______

If the average width of the entry section is 3m and the exit is 6m then the average width is?

In 90 degree parking the length of kerb is 25m, the parking spaces are ______

The spacing between the highway lamps is ______

The most likely cause of accidents is _______