What are the disadvantages of the congestion charge

Expensive to Administer. The costs of collecting a congestion charge are much higher than petrol tax. It requires sophisticated technology and chasing up drivers who don't pay or try to avoid. For smaller cities, the administration costs may be prohibitive.

1. the cost of collecting charge are much higher than petrol tax.

2. it requires sophisticated technology and chasing up drivers who don't pay or try to avoid.