# There are 40 vehicles on a 1 km length of lane of a roadway at a given instant. It is

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There are 40 vehicles on a 1 km length of lane of a roadway at a given instant. It is
1. Practical traffic capacity
2. traffic density
3. traffic volume
4. basic traffic capacity

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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