Which of the following characteristics of an ideal flow-density relationship for fundamental diagram of traffic flow is INCORRECT?
1
When the number of vehicles gradually increases the density as well as flow increases.
2
When the density is zero, flow will also be zero, since there are no vehicles on the road.
3
When more and more vehicles are added, it reaches a situation where vehicles can't move. This is referred to as maximum density.
4
There will be no density between zero density and jam density, when the flow is maximum.