The Prevailing Conditions Referred to Under the Possible Capacity of a Traffic

Multiple Choice

The prevailing conditions referred to under the possible capacity of a traffic lane are ideal if

A) there are at least two lanes for the exclusive use to traffic moving in one direction
B) all the vehicles move at the same uniform speed
C) the widths of lanes, shoulders and clearances to vertical obstructions beyond the edge of the traffic lane are adequate
D) all of the above