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.

<p>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.</p>

If it's happening in Perth, you'll hear about it first on 6PR Breakfast with Millsy and Karl!

<p>If it's happening in Perth, you'll hear about it first on 6PR Breakfast with Millsy and Karl!</p>

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