>> I wonder if the ULEZ has had much impact on either emissions or the amount
>> of traffic in London?
TfL say it reduced NOx, one of its main targets by 50%:
tfl.gov.uk/modes/driving/ultra-low-emission-zone/ulez-expansion#:
I was actually in central London on the day the ULEZ started. Far less traffic around Euston and along the roads down to Chancery Lane than I was accustomed to during the period when that was my daily commute. IIRC commencement co-incided with school holidays which might also have been a factor.
The Congestion Charge had a similar effect at its start but traffic crept up again over the next 5 years.
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