Correct Answer - Option 2 : traffic density
Explanation:
Traffic density is the no of vehicles present in one km length of road. In this case, 40 Vehicles are present on 1 km stretch of road, so
Traffic Density, k = 40 veh/km
Traffic Volume is the no of vehicles that can be passed through a particular section of road during a given period of time. The time period may be hours, minutes, seconds, days or weeks or any other as per the requirement. Generally, it is expressed in Veh/hr, if time period chosen is hours.
Basic Traffic capacity is the maximum possible no of vehicles that can be passed through a particular section of road during a given period of time under most ideal conditions. It is given as:
\({Q_B} = \frac{{1000}}{s} \times V\)
Where
S is the space head way in ‘m’
QB is the Basic Traffic Capacity in Veh/hr
V is the Traffic Speed in km/hr
Design or Practical Traffic capacity is the maximum possible no of vehicles that can be passed through a particular section of road during a given period of time during the prevalent conditions on the road. It is always less than or equal to Basic Traffic Capacity.
Note:
The relation between traffic volume (Q), traffic density (K) and traffic speed (V) is given as:
Q = K × V