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Winding Road

Low Speed Limits Increasing C02 Production?

Written By: Seyth Miersma

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20mphhl.jpgA new study conducted by Britain’s Automobile Association has revealed that slowing traffic down from 30 mph to 20 mph can actually raise the amount of C02 that a car produces.

The AA findings seem to reinforce the notion that most car engines aren’t at their most efficient when running at very slow speeds. The drop from 30 mph to 20 mph can increase pollutant production by up to ten percent.

These test results have got AA members worried that city officials and transportation planners may be setting speed limits unnecessarily low, by not having a full understanding of the environmental ramifications.

Said AA president Edmund King “It would be a bitter irony if local authorities are found guilty of pumping up emissions through the indiscriminate use of these restrictions.”

+ Auto Express: Slowing down increases CO2

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3 Comments

DOWNSHIFTER. January 31st, 2008 9:08 AM Link

“It would be a bitter irony if local authorities are found guilty of pumping up emissions through the indiscriminate use of these restrictions.”

Like no governmental agency has ever done THAT before.

Russ Bellinis January 31st, 2008 10:50 AM Link

In the Los Angeles area, traffic is so bad, that speed limits don’t matter during peak hours (seems like 24/7 is peak hours sometimes). They can set any speed limit they want or eliminate them entirely, you still can’t get above 10 - 20 mph even on the freeways, and much of the time is spent idling while stopped.

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