Any economists out there? Need help with a research project.

What is your hypothesis?

Lower speed limit for trucks > lower accidents?

Same speed for trucks/cars > lower accidents?

I think you need a statistician, not an economist.

Based on a previous study using a bit older data, evidence suggested that when the speed limit varies for semis and cars, there is no significant effect on the amount of semi related fatal accidents.

My hypothesis is basically that last sentence, but I am using newer data to attempt to provide more evidence to these previous results. The issue is the study isn't necessarily an economic study and I am having trouble finding where it pulled its data from, so I am sort of having to start from scratch there. I am also unsure of what controls were used in it(besides some of the other regulations that were tested in this study as well).

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The Safety Impacts of Differential Speed Limits on Rural Interstate ...

https://www.fhwa.dot.gov/publications/research/safety/04156/

(5,6) The studies were mainly cross-sectional comparisons of speed or crashes in States with different speed limits for cars and trucks to those in nearby States with uniform speed ... A study by Garber and Gadiraju conducted in 1991 compared crash rates in the adjacent States of Virginia (DSL) and West Virginia (USL).

Effect of Car/Truck Differential Speed Limits on Two ... - Science Direct

www.sciencedirect.com/science/article/pii/S1877042812043947/pdf?md5...pid

...

by AH Ghods - ‎2012 - ‎Cited by 15 - ‎Related articles

The safety implications of car-truck speed limits have not been adequately researched for two-lane highways. On two-lane ... on compliance among the various drivers in the traffic stream (cars as well as trucks). ... that a U-shaped relationship between the crash involvement rate and the amount of deviation from the average.

The Effect of State Regulations on Truck-Crash Fatalities - NCBI - NIH

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2661438/

by GW Neeley - ‎2009 - ‎Cited by 18 - ‎Related articles

To improve traffic safety, states limit truck length and weight, and some set lower speed limits for trucks than for other vehicles. We examined the impact of truck-specific restrictions and general traffic-safety policies on fatality rates from crashes involving large trucks. We used state-level data from 1991 to 2005 with a ...

‎Abstract · ‎METHODS · ‎RESULTS · ‎DISCUSSION

[PDF]Effects of Differential Speed Limits on Vehicle Speed and Crash ...

www.mautc.psu.edu/docs/UVA-2000-08.pdf

by B Yuan - ‎2002 - ‎Cited by 1 - ‎Related articles

percentile speed, median speed and noncompliance. For the crash data, crash rates were examined by collision type (e.g. rear-end), vehicle type involved (any vehicle or truck involved) and crash severity. In crash analysis, this study did not find any obvious relationship between the crash rates and speed limits, and thus ...

[PDF]Differential speed limits make roads less safe - Owner-Operator ...

www.ooida.com/IssuesActions/Issues/speed_limiters/documents/Speed-Limiter.pdf

In 1964, David Solomon wrote a report entitled Accidents on Main Rural Highways Related to Speed,. Driver, and Vehicle published by the Bureau of Public Roads (predecessor to the Federal Highway. Administration). In order to define the relationship between speeds, characteristics of drivers and vehicles, and accidents ...

Traffic Talk comments: Should the speed limit for cars and semi trucks ...

www.mlive.com/news/index.ssf/2012/01/traffic_talk_comments_should_t.html

Jan 24, 2012 - Michigan is one of a relatively few states with different highway speed limits for cars and heavy trucks. ... This appears to contradict a 2005 study by the National Highway Administration that found no significant difference in car-truck crash rates in DSL states versus USL states. It may

What is the older study you are using? Who wrote it? Doctors? Economists? Engineers?

Statistics acumen is always helpful.

Here, you would want to control for state traffic volume, state size in square miles, and population density. Your disparity between car and truck speed limits could be either absolute or relative speed differences.

A number of other variables might be nested under each of those but keep it simple.

Lots of extraneous variables that vary by state. Alaska and Arizona might have the same law but they're very different. You might find correlation but probably not causation.

Searching for economic+analysis+truck+speed+limts turned up some interesting stuff.

I assume you've found Timothy Gates, who's written quite a bit on speed limits and safety. If nothing else you could troll through his reference lists to see if there's anything out there you've missed.

He's an engineer, so it's not clear he gives the details you are looking for. As you may have discovered, every field has different standards about what needs to be included.

If you go to this page, you can see his references without reading the papers. Just click on a paper and then click on the references tab:

http://trrjournalonline.trb.org/author/Gates%2C+Timothy+J

PS You probably can't control for traffic speeds, but they will affect your results. If everyone is going under the truck speed limit, then the differential speed limits have any impact on behavior.