The specifications for road signs are specified by ______

The most likely cause of accidents is _______

Peak hour factor is expressed in percentage of ______

An intelligent driver who consumed alcohol will have a chance of _______

If the angle of merging is low, then the relative speed will be ______

The cross slope of paved footpath may be ______

When the gap of the vehicle changes to a smaller lane then it is called ______

What is the minimum width of side walk?