Pay not to use your car

Residents in the London Borough of Richmond are to be charged up to three times the normal rate for residents parking if they own a 4x4 vehicle.
This is idiocy. If they don't drive their gas guzzler they'll be charged a surcharge for parking it. If you want them off the road increase the cost of driving it. What will happen as a result of this policy is that 4x4 owners will be driving around looking for a parking place that doesn't cost the earth - and in the process they'll be burning fuel and costing everyone the earth.
And how do you police this process? My vehicle can drive all four wheels but only if the wheels lose their grip - so most of the time it's a two wheel drive vehicle. Whilst it's parked none of the wheels are driving. There are lots of two wheel drive cars that cause more damage to the planet than my car. So if I lived in Richmond would I be penalised?