10 votes

Does lowering speed limits by 10 km/h have any impact on air pollution?

Generally, every car has a specific speed where fuel efficiency (i.e. miles traveled per gallon) is highest. This is mostly around 40 - 60mph (~65 - 95 km/h). Above and below this speed fuel ...
redleo85's user avatar
  • 1,960
8 votes

Does the "Double Demerit Point" scheme in parts of Australia reduce serious car accidents?

There is a report evaluating the trial of the double demerits scheme in Western Australia in 2002/2003: Evaluation of the trial period for double demerits legislation in Western Australia. To compare ...
TimRias's user avatar
  • 3,835
7 votes

Does lowering speed limits by 10 km/h have any impact on air pollution?

First, as far as I remember, there is a major factual mistake (possibly a mistranslation) in the article you quote. What happened is that speeds were reduced by 20 km/h in non-urban areas. I do not ...
Gilles 'SO- stop being evil''s user avatar
4 votes

Does decreasing an urban speed limit from 50 km/h to 30 km/h increase air pollution?

It depends, but not in general I found a report to the German Bundestag, which references several studies. I would summarize the results as follows: 1.) particulate matter from the Motor exhaust ...
kutschkem's user avatar
  • 1,133
4 votes

Does the establishment of a legal upper speed limit on highways lead to a reduction in traffic deaths and accidents?

Those are number from work done by the IIHS in the US, this is an interesting read about speed limits in general and not just safety: Fatalities also went up. Deaths on rural interstates increased 25-...
Rsf's user avatar
  • 3,004
1 vote

Does lowering speed limits by 10 km/h have any impact on air pollution?

The most popular emission models (Caline in the US, Copert in the EU) provide emission functions for average trip speeds. This should no be confused with changes to immediate speed (for which there ...
Luc Int Panis's user avatar

Only top scored, non community-wiki answers of a minimum length are eligible