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All I can think of now is:

> drunk driving may kill a lot of people, but it also helps a lot of people get to work on time, so, it;s impossible to say if its bad or not,

-- https://twitter.com/dril/status/464802196060917762

Less wasted time and lower pollution.

Fuel efficiency of most cars drops precipitiously at higher speeds. You're generating more pollution by speeding, not less.

Maybe in 1974. My car does about the same at 80 MPH as it does at 65 MPH, as counterintuitive as that seems.

It helps keep people from driving too complacently and unattentively.

While it is fallacy of herd mentality, the safest speed nonetheless tends to be the speed of the other vehicles around you. Speed deltas are the real danger—not failure to adhere to a specific, oft-arbitrary number.

If people hadn't violated the 55 MPH NMSL frequently and flagrantly, we'd still be stuck with it.

Setting speed limits based on political goals rather than engineering principles costs lives.