An expert has slammed local authorities for introducing schemes that treat drivers as “cash cows” amid fears they could have a disastrous impact on motorists. Motorists have dealt with expensive charges in recent years thanks to high car insurance costs and car tax hikes, while millions are also at risk of being charged for using the roads through council schemes. There are currently seven Clean Air Zones namely Bath, Birmingham, Bradford, Bristol, Portsmouth, Sheffield and Tyneside (Newcastle and Gateshead), in addition to the London Ulez and Congestion Charge. Four Low Emission Zones started…