Travel Plan Performance Indicator

I have been wondering about a performance indicator (PI) for travel plans. I think what might work is.

Distance travelled BY motor vehicles (except scheduled buses) to, from or for work / Number of full-time equivalent employees.

This avoids having a PI for public transport and a PI for cycling and a PI for walking, and a PI fpr working from home, etc.

Note that this is the distance travelled by motor vehicles, not people. That way if car sharing goes up, the PI value goes down. This should work for the whole council and any office or department.

It would be better to use fuel consumption, or better still CO2 emmissions, but distance travelled is easier to measure.