speed

How fast a vehicle is going in kilometers per hour (kph)

High-Level Explanation

This signal contains the rate at which a vehicle is traveling in kilometers per hour (kph). That is, the rate of change of change of displacement with respect to time.

This signal ranges between 0 and 255 (as it is represented by 8 bits in memory).

Enables

• trip identification: If speed is zero for sufficiently long, it is probably indicative of the end of a trip

Enabled By

Known Quirks

• This signal is null frequently. For an example vehicle, it is null for 72% of the records. As shown in an example below, this signal is frequently missing intermittently.

Visualizations with Explanations

Map with gps data points color coded by speed (which is in units of kilometers per hour)

Histogram of speed observations for an example vehicle

Histogram of speed observations for an example vehicle weighted by distance travelled at that speed

Example where speed is null intermittently