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I feel less likely to be exposed to the virus in my own car than I do on public transport.
There is also the fixed costs bit. Lots of people that might ordinarily have a travel card don't at the moment so will have to pay for public transport. I'm still paying the fixed cost of running my car and the incremental costs of some short journeys are much lower than public transport fares.
lots of busses go to the park, 2 national rail stations and DLR walking distance, why drive?