A think tank says reducing the speed limit as low as 30kmh in built up areas will help reduce vehicle emissions and make roads safer.

Grattan Institute Transport Program Director Marion Terrill said it’s part of a world-wide trend.

“It’s actually become very common overseas, the latest city to do is Paris,” she told Mark Gibson on 6PR Breakfast.

“The reason that they do it is not anti-car, it’s more that there’s a lot of tail-pipe pollution, and there’s a lot of pedestrian accidents.”

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