What a stupid thing to be suggesting. Does it occur to him that most motorists living in London will also venture outside the capital using roads that, in Khans' eyes they haven't paid to use. So perhaps Surrey/Essex/Hertfordshire/Kent should also charge motorists leaving London because they haven't paid any tax outside London. Sigh. It's just idiotic. Especially so since he was arguing against the extension of the congestion charge when the Government proposed it!
Unlike the rest of England /UK, TfL get no funding for the "trunk" road network that they maintain from Central government. So London drivers contribute to road maintenance in the rest of the country through VED and other taxes and duties via central government, but there is no central government funding going towards London.
The road maintenance was funded from other TfL income sources like surplus (above cost) tube income advertising both of which have disappeared in 2020. The other main road maintenance funding source is the mayoral council tax slice but then non Londoners don't pay that
The road funding was an issue that needed to be addressed anyway and HMT asked TfL to come up with road pricing proposal as HMT will need a way to replace significant lost VED and fuel VAT due to electrification of the vehicle fleet from 2025 onwards.
As central government isn't contributing to the maintenance cost of non-Londoners use of the roads, the proposal from the mayor is incredibly logical especially in the light of likely London council tax increases in April and ULEZ etc covering Londoners use of roads.
In everyone (who has bothered to inform themselves) eyes apart for the governments Londoners contribute to the road maintenance elsewhere but no road users outside London contribute to road maintenance in London. This proposal is about addressing that discontinuity and was invited by HMT.
It can easily be rolled out using the commercial vehicle LEZ ANPR camera network.
There's already a larger charge for lorries entering greater London as part of the low emissions zone
And most fleet operators have focused their new Euro VI vehicles over the last few years to the London area especially with commercial LEZ part 2 coming in 4 months.
From my observations in the last couple of weeks, A202 Camberwell New Road and A2 Old Kent Road are as busy as ever at the moment - and these are before you get to the Congestion Charge / ULEZ boundary.
That matches my experience. This week parts of London have been back to ‘normal’ traffic wise in daytime.
That matches what I'm seeing too.