Today I had a chance to test my presumption. I was crossing over I-66 on the pedestrian overpass near Madison Manor park (map). I tried to notice how many cars were scofflaws but soon realized that it was difficult to tell if there was a child in the back seat or not. Also, many of the cars had the clean-car license plates. Then I realized I could read the license plates easily. Traffic seemed to be traveling about 30-40 miles per hour, slower than free-flowing. So one could argue that there was congestion, since the HOV lanes were not moving at 55 miles per hour. So I started counting.
- 333 cars: 67 with clean-car license plates; 266 without.
- 1 motorcycle
- 2 buses
- 1 18-wheeler (which are illegal on this highway)
- 1 eastbound 6-car Metro train
Here's some quick math extrapolating to an hour and making some assumptions:
- 2700 HOV cars with 2.2 riders = 6000 people
- 670 clean-fuel cars with 1.1 riders = 750 people
- 20 buses with 40 people = 2000 people
- 10 metro trains with 800 riders = 8000 people