It found that motorists within one mile of city centres are edging along at an average of just 5mph in London and 6mph in Edinburgh, Glasgow and Manchester.
It makes the cars about as fast as a horse and cart on an open road.In Liverpool and Bristol the average speed in the city centre is 7mph, rising to nearly 9mph in Birmingham, 10mph in Sheffield and Bradford and an almost zippy 11mph in Leeds.
Even within five miles of city centres the traffic does not flow much more freely.
The slowest is 8mph in London rising to 15mph in Glasgow and Leeds with most other cities managing about 12mph, according to In-car Cleverness which relays a vehicle’s performance back to fleet managers.
But most of the cities are getting worse with, the centres of London, Glasgow, Manchester and Bristol about 1mph slower than last year.
Travelling times are likely to be slower during term times when the roads get busier due to the school run which started across most of the country.
In-Car Cleverness recorded the urban traffic speeds of 400,000 cars on working days between 6am and 8pm between April and June last year and this year.
As the figures are averaged out over the day, rush hour traffic is likely to have been even slower.
This spells frustration for millions because Department for Transport statistics show that 68 per cent of people drive as part of their commute.As a result the economy is losing billions due to the time wasted on the journey to work.
And traffic volumes across the country rose nearly two per cent between April last year and this March.
The head of Sales at In-car Cleverness, Paul O’Dowd, said: “The figures paint a stark picture of how everyday commuters, drivers and even businesses are struggling to get around or operate in some of the biggest hubs in the UK.“
Traffic-management technology is becoming readily-available to drivers and businesses, and with commuters and businesses being robbed of time and money, the technology can help avoid costly traffic jams.”