Traffic Speed Layers

1.0 Selectable Layers

The following are Traffic Speed data layers that can be selected within Insights including:

• Average Speed 
  Quantifies the average speed of observed trips along a road segment.
• 50th Percentile Speed 
  Also known as the median speed, where half of the observed vehicles travel at or below this speed, and half travel faster.
• 85th Percentile Speed 
  Quantifies the speed at or below which 85% of observed trips travel along a road segment.
• 95th Percentile Speed 
  Quantifies the speed at or below which 95% of observed trips travel along a road segment.

• Average Difference: Quantifies the difference between the speed limit and average speed of observed trips along a road segment. It is provided in miles per hour (mph).
• 50th Percentile Difference: Quantifies the difference between the speed limit and the speed at or below which 50% of observed trips travel along a road segment. It is provided in miles per hour (mph).
• 85th Percentile Difference: Quantifies the difference between the speed limit and the speed at or below which 85% of observed trips travel along a road segment. It is provided in miles per hour (mph).
• 95th Percentile Difference: Quantifies the difference between the speed limit and the speed at or below which 95% of observed trips travel along a road segment. It is provided in miles per hour (mph)

2.0 Map View

When selecting one of the Traffic Speed layers, the map will color-code the road links based on their speed value across the entire selected time period.  For instance, if a customer selects to view data for the month of October 2023 and selects the Average Speed layer, the colors on the road links will represent the Average Speed across the entire month.

Traffic Speed Data Legend

The following categories are used to color the data according to the speed across all Traffic Speed Data layers:

Speed Limit Difference Legend

The following legend categories are used by default to color the data according to the speed limit difference across all Speed Limit Difference layers: