Here's another study from 1992 that agrees with what tjts1 has been saying. Very intersresting. People just drive as fast as they want regardless of posted speeds.
Quote:
Lowering speed limits by 5, 10, 15, or 20 mi/h (8, 16, 24, or 26 km/h) at the study sites had a minor effect on vehicle speeds. Posting lower speed limits does not decrease motorist's speeds.
Raising speed limits by 5, 10, or 15 mi/h (8, 16, or 25 km/h) at the rural and urban sites had a minor effect on vehicle speeds. In other words, an increase in the posted speed limit did not create a corresponding increase in vehicle speeds
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So I guess fuel economy and emissions are something that we don't need to worry about since no one will try to conserve fuel if the DOT is correct in the report.
