Speed limits indicate the legal speed for a vehicle. Depending on the country the values are given in mph or kph.
A speed limit has the following attributes:
Value of the speed limit. Range: 1 - 999
For roads that allow an unlimited speed, the speed limit value is 999.
A value of 998 is applied to ramps if there is neither a posted speed limit nor a legal speed limit.
Unit for the speed limit. The following enum values are supported:
miles per hour (mi/h)
kilometers per hour (km/h)