Motorized travel, that is; we don’t have good numbers for walking and cycling. However, in continuing its incremental publication of Highway Statistics 2019, the Federal Highway Administration yesterday posted miles of driving and other data for the nation’s 495 urban areas. Since transit passenger miles for each of the urban areas are in the National Transit Database, we can calculate transit’s share of motorized travel.
To do this, I’ve created a slightly enhanced spreadsheet for table HM-72. First, I put all of the urban areas on one worksheet; the FHwA version divides them into seven worksheets, which can make it hard to find some of the smaller urban areas.
Second, I updated the population data using the Census Bureau’s 2019 estimates; I think the population numbers in HM-72 are based on the 2010 census. Unfortunately, the Census Bureau doesn’t seem to have yet calculated population numbers for most urban areas with under 65,000 people and a few bigger ones, but I included the ones that are available.
Next, I added the transit passenger miles from the National Transit Database. I calculated driving passenger miles by multiplying daily vehicle miles traveled by 365 and then by 1.62 to account for vehicle occupancies. I used the 2018 table VM-1 to calculate this since the 2019 edition isn’t out yet. Since I don’t consider truck drivers to be “passengers,” I added up all of the passenger-miles of travel for passenger vehicles, leaving out heavy trucks, and divided by the vehicle miles for all vehicles, including heavy trucks.
Transit’s share can be calculated by dividing transit passenger miles by the sum of transit and highway passenger miles. (I realize that buses are double counted here since they are included in both transit and highway passenger miles, but fixing this won’t change the numbers significantly.)
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In the New York urban area, transit’s share is 11.9 percent; it’s 7.0 percent in San Francisco-Oakland, and under 4 percent everywhere else. An exception is Hanford, California, which is 12.7 percent. But Hanford is the headquarters of California’s vanpool operations that take place all over the state and so don’t represent Hanford transit.
Some transit agencies serve more than one urban area. For example, Utah Transit serves Ogden, Provo-Orem, and Salt Lake City. When you count just Salt Lake City, transit seems to carry 2.2 percent of passenger travel. But adding driving in Ogden and Provo-Orem cut’s transit’s share in half.
Other urban areas where this is an issue include San Francisco-Oakland (where Concord, Livermore, and Vallejo should be added) and Denver (where Boulder and Longmont should be added). Adding miles of driving and transit in these urban areas reduces transit’s share in the Bay Area from 7.0 to 5.4 percent and in the Denver area from 1.7 to 1.6 percent. I’ve done these calculations in rows 501, 502, and 503, but if you know of any other agencies that cross urban area lines you will have to do the recalculations yourself.
I hope you find the slightly enhanced spreadsheet useful.
