Flow Characteristic Plots - free flow

Density Plot

A map of the various loop detector locations is available. As well as a key to the incident boxes on the density plots.

The following characteristic traffic flow plots were obtained from loop detector #6 from 5:00am until 10:00am. Note from the density plot that during this time period there was no significant buildup of density.

Speed vs Flow

Speed vs Occupancy

Flow vs Occupancy

The interesting thing to note is that the values on the plot only sketch out one side of each characteristic plot. For example, if you take a look at the plot of flow vs occupancy, you can see that only one side of the hump is represented. If you take a look at the same plot for the incident conditions then you can see a big difference.

Some things to note:

• The loop data used had an output period of 30 seconds.
• The loop data has been smoothed with an exponential filter with a weight of 0.9.
• The characteristic plots were made from the aggregate over all lanes. So the flow is the sum of the flow over all the lanes.