Traffic Flow

The actual number of vehicles that are passing through a point on

a traffic facility during an hour.

What is this?

• Demand

• Volume

• Flow

• v/c Ratio

Given that a 6-lane highway has 3 lanes per direction.

If the flow per lane is 1800 veh/h/ln in the eastbound direction.

What is the flow for that direction?

• 5400 veh/h

• 3600 veh/h

• 2400 veh/h

• 1800 veh/h

Assume that headways between consecutive vehicles in a lane are uniform. If the time headway is 6 seconds, what is flow rate?

• 1800 veh/h/ln

• 1200 veh/h/ln

• 900 veh/h/ln

• 600 veh/h/ln

Given that the jam density of a highway segment is 60 veh/km/ln and

Free-Flow Speed (FFS) is 100 km/h.

If the average speed of vehicles on the segment (u) is 55 km/h.

What is the flow condition?

• Congested Flow

• Uncongested Flow

• Free Flow

• Completely Congested

Assume that headways between consecutive vehicles in a lane are uniform.

If the space headway is 20 meters, what is the density?

• 200 veh/km/ln

• 180 veh/km/ln

• 100 veh/km/ln

• 50 veh/km/ln

Given that the jam density of a highway segment is 60 veh/km/ln and

FFS is 100 km/h.

If the average speed of vehicles on the segment (u) is 50 km/h.

What is the current flow rate?

• 1200 veh/h/ln

• 1500 veh/h/ln

• 2000 veh/h/ln

• 5000 veh/h/ln

Number of vehicles arrived during a 15-minute time interval,

and converted to vehicles per hour.

What is this?

• Flow

• Volume

• Demand

• v/c Ratio

Given that the jam density of a highway segment is 80 veh/km/ln and

FFS is 120 km/h.

What is the capacity?

• 1800 veh/h/ln

• 2200 veh/h/ln

• 2400 veh/h/ln

• 4800 veh/h/ln

If you want to get datapoints in the congested region of the speed-flow curve, which location that speed & flow should be measured?

• A

• B

• Either will do.

• Neither of them.

For a low flow condition, the distribution of the arrival rate is ...

• Binomial

• Normal

• Poisson

• Exponential