Susan Hall blasted Sadiq Khan’s “war on motorists” after new research found London has the world’s slowest city centre for drivers because of widespread 20mph speed limits.
Location technology company TomTom said journeys of 10 kilometres (6.2 miles) in central London took an average of 37 minutes and 20 seconds last year.
It was the longest time among the 387 cities across 55 countries analysed, putting London top of the slow city centre ranking for the second year in a row.
Ms Hall, the Tory London mayoral candidate, said: “This is the consequence of Sadiq Khan’s war on motorists, which has gridlocked our roads and made London the worst city in the world to drive in.
“We cannot afford another four years of Sadiq Khan grinding our city to a halt and making life worse for families, businesses and tourists.
“With Londoners’ support next May, I will stop these blanket 20mph limits on main roads, scrap Sadiq Khan’s ULEZ expansion, and get our city moving.”
The research found Irish capital Dublin was second, with 10km trips typically taking 29 minutes and 30 seconds.
Toronto in Canada was third on 29 minutes, Milan in Italy was fourth on 28 minutes and 50 seconds, and Lima in Peru was fifth on 28 minutes and 30 seconds.
In the UK, Manchester was second to London with a time of 23 minutes and 30 seconds, followed by Liverpool third on 22 minutes and 50 seconds.
TomTom based its analysis on journeys in a 5km radius of city centres.
The company’s head of government and regulatory affairs, Stephanie Leonard, said: “London really is the slowest place in the world to drive a car.
“Especially in the core city centre, you don’t have maximum speed limits of 50mph or higher, it’s a maximum of 20mph. You don’t have the infrastructure for driving very quickly.”
A spokesperson for the Mayor of London said: ”This study is misleading as it only includes analysis from a very small part of the city centre, not the whole of London.
“Comprehensive TfL data suggests that journey times on the TfL road network actually remain at similar levels to those in 2019, while analysis from around the UK suggests that lower speed limits have not increased congestion.
“Road works are the biggest cause of congestion in cities – which is why the Mayor’s Infrastructure Coordination Service is working with boroughs and utility companies to reduce delays caused by road works, helping to save London road users over 1,250 days of road works since 2019.”
