A motorist has become the first person to successfully appeal against a speeding conviction linked to a controversial stretch of the A20, where thousands of drivers were fined amid confusion over conflicting speed limit signs.

John Abbott, from Kent, had his conviction overturned at Kingston Crown Court last month following a long-running dispute over speed restrictions on the Kent-bound section of the A20 in Sidcup, south-east London.

The controversy began in October 2023, when a temporary 40mph speed limit was introduced along the road due to concerns over flooding.

However, a rogue 50mph sign remained in place, creating confusion among motorists who were subsequently caught exceeding the lower speed limit.

The restrictions remained in force until October 2024, with numerous drivers receiving fines despite the conflicting signage.

Following his successful appeal, Mr Abbott said he "was extremely pleased, not just for myself, but for the thousands of drivers that have been fined in this case".

He described the penalties imposed on himself and other motorists as a "massive injustice", arguing that the consequences had extended far beyond the initial financial penalties.

According to Mr Abbott, drivers faced increased insurance premiums and restrictions on their ability to drive, with some experiencing difficulties travelling to work and earning a living.

His successful challenge marks a huge development in the dispute, which has seen motorists question the fairness of penalties issued while contradictory speed limit signs were displayed.

However, Transport for London (TfL) has defended its decision to introduce the temporary restriction, maintaining that the reduced speed limit was necessary because of flooding concerns.

The transport authority said it "remains confident" that its decision to enforce the 40mph limit was correct.

Mr Abbott’s overturned conviction comes as welcome news to campaigners who have been fighting against the penalties for the last two years.

Tory MP Laura Trott has now questioned what London Mayor Sadiq Khan is going to do to notify drivers who have been issued speeding fines “incorrectly”.

A TfL spokesperson said: "Safety is our number one priority and we temporarily introduced a 40mph speed limit on the A20 Sidcup Road in response to a number of incidents caused by ongoing flooding issues, which posed a risk to life.

"After we repaired and resurfaced the road, the speed limit was returned to 50mph. We remain confident that enforcement of the speed limit here was necessary, given the safety risks, and we will be resisting the appeal challenging our enforcement action."

City Hall has been contacted by The Standard for comment.