Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

# Vehicles Traffic Flow and Density

## Traffic flow and density as used in highway design.

### Vehicle Traffic Flow

The vehicle traffic flow on a road can be expressed

q = n 3600 / t                                   (1)

where

q = vehicle flow (no. vehicles per hour)

n = no. vehicles passing in t seconds

t = time for passing vehicles (s)

#### Example - Vehicle Traffic Flow

If 1000 vehicles passes in 2 hours (7200 s) - the flow can be calculated

q = 1000 3600 / 7200 (s)

= 500 vehicles per hour

### Vehicle Density

Vehicle density can be expressed as

k = n 5280 / l                              (2)

where

k = vehicle density (vehicles per mile)

n = no. of vehicles occupying a length l of the road

l = the length of road occupied by the vehicles (ft)

(2) expressed in km

k = n 1000 / l                              (2b)

where

k = vehicles per km

n = no. of vehicles occupying a length l of the road

l = the length of road occupied by the vehicles (m)

## Related Topics

• ### Miscellaneous

Engineering related topics like Beaufort Wind Scale, CE-marking, drawing standards and more.

## Related Documents

• ### Banked Turn

A turn or change of direction in which the vehicle banks or inclines, usually towards the inside of the turn.
• ### Car - Required Power and Torque

Power, torque, efficiency and wheel force acting on a car.
• ### Car - Traction Force

Adhesion and tractive force between car wheel and surface.
• ### Car Acceleration

Car acceleration calculator.
• ### Cars - New vs. Old Car Cost Calculator

Calculate and compare the costs between owning a new vs. an old car.
• ### Centripetal and Centrifugal Acceleration Force

Forces due to circular motion and centripetal / centrifugal acceleration.
• ### Noise generated by Road Traffic

Estimate noise level generated by traffic.
• ### Piston Engines - Compression Ratios

Cylinder volume and compression ratios in piston engines.
• ### Piston Engines - Displacement

Calculate piston engine displacement.
• ### Rolling Resistance

Rolling friction and rolling resistance.

## Search

Search is the most efficient way to navigate the Engineering ToolBox.

## Engineering ToolBox - SketchUp Extension - Online 3D modeling!

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with older versions of the amazing SketchUp Make and the newer "up to date" SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp Make/Pro from the Extension Warehouse !

We don't collect information from our users. More about

We use a third-party to provide monetization technologies for our site. You can review their privacy and cookie policy here.

You can change your privacy settings by clicking the following button: .

## Citation

• The Engineering ToolBox (2012). Vehicles Traffic Flow and Density. [online] Available at: https://www.engineeringtoolbox.com/vehicle-flow-density-highway-design-d_1831.html [Accessed Day Month Year].

Modify the access date according your visit.

7.8.15

.