tldr version;

Road pricing can be a useful means of addressing infrastructure fiscal issues, reducing congestion, and improving environmental quality and it has a chance of being implemented if advocates focus on mobilizing urban voters.

Thanks to all respondents.

This post is a quick detour from the NoL Foreign Policy Survey posts.

Among other projects I am working on, I am tinkering with a public opinion project aimed at the OReGO project. The OReGO is a pilot program operated by the State of Oregon to experiment with an alternative to the existing gasoline tax. Currently Oregonians pay 30 cents per gallon of gasoline, on top of the federal 18.4 cent per gallon tax. Volunteer participants of OReGO instead pay a charge of 1.5 cents per mile driven on state roads.

The primary goal of the program is to find a better way to fund the state’s infrastructure. The current system is inadequate because automobiles are becoming increasingly more fuel efficient and so, on a per mile basis, pay less for road use. Despite paying less these automobiles still rack up costs in road damage.

Advocates of OReGO, and other road pricing schemes, also hope that the program will serve as a means of combating congestion by making drivers more conscious of the marginal cost of their driving and encouraging them to avoid excess driving. The gasoline tax does this already, but very crudely in comparison.

Some advocates also hope to use road pricing as a means of improving local environmental quality and addressing climate change. Automobiles are a significant source of pollution and so reducing their use would yield environmental benefits. Even if the program kept the same number of cars on the road it could reap benefits if it reduced stop and go traffic; automobiles pollute more in stop and go traffic than free flow.

There is quite a bit of research from economists and urban planners on the issue, but public opinion research on it is relatively rare. What research exists tends to focus on either toll roads or in foreign regions. The reason for the gap in the literature is simple enough to explain – no jurisdiction in the United States has adopted road pricing. There have been a few small scale experiments, but they were largely engineering tests and surveyed only the opinion of participants. I hope to fill this gap in the literature by (eventually) conducting a large scale public opinion study of Oregonians.

The below pilot study had 220 respondents recruited through various Oregon sub-reddits (e.g. Portland, Eugene, and Salem). Respondents were obviously not representative of Oregon at large. The sample size was also small for an academic study of Oregon and there is a lot of noise. Most of the results presented are statistically insignificant. As a convenience sample though this survey was nonetheless useful. My goal in this survey was more about testing the survey before fielding it more broadly.

I thank all respondents to the survey – you’ve all helped the progress of science.

Survey Experiment Results:

The survey had a survey experiment. The purpose of survey experiments is to see how changes in phrasing, or other survey elements, influences response.

The experiment was in how OReGO was presented. Respondents were split into three sub-groups and received slightly different explanations of the program. In the base scenario they were told the program was simply a funding mechanism. In the congestion scenario they were also told about its possible congestion benefits. In the final they were additionally told about its possible environmental benefits.

OReGo is a pilot program currently being operated by the Oregon Department of Transportation. Participating drivers are being given the opportunity to pay 1.5 cents per mile they drive on public roads instead of the current 30 cent per gallon tax that the state of Oregon currently charges.

Advocates of OReGO, and similar road pricing schemes, argue that the program serves as a more dependable means of funding infrastructure than the current gasoline tax. They point out that as vehicles become more fuel efficient the amount that drivers pay per mile is decreasing, but costs associated due to road damage are not similarly decreasing. This means that in the long term the current gasoline tax will be unable to cover infrastructure costs. (/End of Base Scenario)

Advocates of OReGO also point out that the program can help reduce congestion by discouraging excessive driving and encourage the use of alternative means of transportation such as bicycling, walking, or transit. Although drivers currently pay for their automobile use in the form of the gasoline tax, many view it as a fixed payment. OReGO, which is charged on a per mile basis, may serve to make drivers more conscious of the marginal cost of their driving. (/End of Congestion Scenario)

OReGO could lead not only to reduced congestion, but could also serve to improve local air quality. One of the major sources of air pollution is automobiles, especially in stop and go traffic. (/End of Environmental Scenario)

Looking at support for adopting OReGO within five years the different treatments are little different from one another. The congestion treatment received a decline in support, but it is pushed back up in the environmental treatment.

I regret not adding a fourth group where respondents are told about the base option and the environmental benefits, but congestion is not added. As it is, it is hard to tell if the decline in support for OReGO in the congestion treatment is because people don’t care about ways to address congestion, or they dislike attempts at social engineering.

When we look at treatment effects among only those who identified living in an urban area the effects get more interesting. Urban voters were very responsive to the idea of environmental benefits and increased support for OReGO by over 10 percentage points.

What seems to be driving the difference in support for OReGO is inter-regional differences in perceived local air quality. Those who perceive local air quality to be ‘very good’ are least likely to support OReGO. This finding is exaggerated when looking at only urban respondents.

I played around to see if this was a statistical artifact from the above treatment; i.e. it is possible those who lived in ‘very good’ air quality regions received the ‘environmental treatment’  and I am picking up the latter effect. This was not the case.

Is this a simple case of those living in high quality areas having no interest in improving the region? A “I have mines” attitude. No. When I look at support for OReGO by how respondents judged local air quality had changed in the past five years, those who thought their local air quality was improving also had the highest support for OReGO.

There is a definite relationship here between support for OReGO and perception of one’s local air quality. I can’t put my finger on it just yet.

Bonus result: daily bicyclists are those most supportive of OReGO.