Britain’s top toll road is the M25 Dartford Crossing, making over £209 million yearly, with almost £100 million from drivers using accounts. The Toll road survey showed the M6 Toll generates the second highest revenue at £53.7 million annually. Other high-earning toll roads include the Mersey Gateway and the Humber Bridge. The cost of toll charges varies, with the M6 Toll being the most expensive at £7 for cars.