The United States should not build more freeways simply because China has more. But there are several reasons why this country has a shortage of freeways. These include congestion, safety, and finance.
The Texas A&M Transportation Institute estimates that congestion in America’s 494 urban areas wasted 8.8 billion hours of travelers’ time and 3.3 billion gallons of fuel and cost $179 billion in 2017.133 In the post‐pandemic world, increased numbers of people working at home will reduce morning congestion. However, one study found that telecommuters drive more miles per day than people who drive to work.134 Since they tend to do this driving in the afternoons, the number of hours of congestion in the afternoons may grow.
Safety is an issue because urban freeways are the safest of all roads to drive on, and rural freeways are the safest rural roads. Highway engineers classify roads as arterials, collectors, and local roads and streets. Freeways are arterials, but so are other major roads, generally including roads with speed limits of 45 mph or more.
In 2019, 4.5 people in the United States died in traffic accidents for every billion vehicle‐miles traveled on urban freeways, while 7.9 people died per billion miles on rural freeways. Non‐freeway arterials, however, are some of the most dangerous roads in the country: 14.4 people died per billion miles in urban areas and 19.8 people in rural areas in 2019. Converting 1,000 miles of urban non‐freeway arterials to freeways would save about 70 lives per year, while converting 1,000 miles of rural non‐freeway arterials to freeways would save about 30 lives per year.135
The financial reason to build new freeways is simple: new freeways, if located in the right places and priced properly, can pay for themselves. This is unlike high‐speed rail or any passenger rail in the United States, which require both operating and capital subsidies. For the government to refuse to build new roads that can pay for themselves is to act as a monopolist with all the negative connotations that implies.
The main argument against building more roads is that such roads supposedly increase driving and so fail to relieve congestion. This argument assumes that the highway industry can generate more customers simply by building more roads, ad infinitum. That’s obviously not possible. What is true is that new transportation facilities can create economic opportunities. If people take advantage of those opportunities, it generates economic growth. Somehow, roads are demonized for doing this while rail advocates insist we run trains that are half empty.
Highway opponents argue that making cities more compact and improving transit and intercity rail service will give people access to the resources they need without as much auto travel.136 But this is a pipe dream. According to the University of Minnesota’s Accessibility Observatory, even in New York, one of the most compact urban areas with the best transit service in America, the average resident can reach four or more times as many jobs in a 60‐minute‐or‐less auto drive as a transit trip of the same length.137
One argument against allowing more travel is that it uses energy and produces greenhouse gas emissions. But compact cities tend to be more congested cities, and that congestion wastes more fuel. According to the Department of Energy, people who live in densities of 10,000 to 25,000 people per square mile (densities found in such places as Chicago and San Francisco) drive about 16 percent fewer miles than people who live in densities of 1,000 to 2,000 people (typical of low‐density suburbs). But the vehicles in the denser areas average about 17 mph while lower‐density vehicles move about 26 mph. The department also says that vehicles moving at 25 mph use 25 percent less fuel per mile as vehicles moving at 15 mph.138 Thus, people living in denser areas may actually use more fuel than people in low‐density areas. Since greenhouse gas emissions are proportional to petroleum fuel consumption, people in the denser areas also emit more greenhouse gases.
Aside from the arguments from anti‐highway groups, the main obstacle to building new freeways or converting non‐freeway arterials to freeways is an obsolete system of paying for roads. Fuel taxes made sense in 1956 because the costs of tolling were very high. Today’s electronic tolling systems are almost as economical as fuel taxes and have several major advantages.
First, fuel taxes don’t automatically adjust for inflation, and raising those taxes is always a political battle. Fuel taxes also fail to adjust for electric or other more fuel‐efficient vehicles. In addition, existing fuel taxes go mainly to the states, while local governments rely heavily on property and other taxes to pay for road and street maintenance. Most importantly, fuel taxes fail to send appropriate signals to drivers about which roads are more expensive to drive on and similarly fail to send signals to highway agencies about where more road capacity may be needed.
Sending the right signals can help relieve congestion. Highways that use congestion pricing guarantee that travelers enjoy free‐flowing traffic at any time of the day. Such congestion pricing should not be confused with cordon pricing, which is sometimes called congestion pricing, that simply charges a fee for crossing a line into a city or downtown area. Cordon pricing is a fundraising tool that doesn’t really relieve congestion.
If fees are set to ensure that roads don’t become congested, then roads that generate more fees than are needed to recover the costs of building and maintaining those roads send a signal that more roads could and should be built in that corridor out of the excess fees.
One way to build new freeways is to make them all toll roads. But if existing roads remain untolled, some people will avoid toll roads, thinking they can save money. A much better system would be to completely replace existing gas taxes, vehicle‐registration fees, and tolls with a mileage‐based user fee system. Such a system would allow all owners of roads—federal, state, county, city, or private—to charge fees to the people who use them. Oregon and other states are beginning to implement mileage‐based user fees systems that protect people’s privacy even as the systems earn revenue to pay for roads.139
If Secretary Buttigieg or members of Congress want to make the United States a world leader in transportation, they should focus on highways, not high‐speed rail. One way to do so would be for Congress to adjust the formula for distributing highway funds to the states to give a bonus to states that convert from fuel taxes to mileage‐based user fees, provided that those user fees are dedicated to the roads.