A trial investigating whether red right-turn arrows along busy Perth roads should be turned off at night has been abandoned early following an increase in crashes.

Main Roads commenced the trial in late 2015 in an attempt to reduce traffic delays and end the driver frustration that came with sitting at a red turning light when no cars were around.

Perth's red light turning arrow trial has been aborted early after an increase in crashes. Credit:Marta Pascual Juanola

Right-hand turning lights were switched off between 9pm and 6am at 14 intersection locations across Perth including six along Canning Highway, three on Orrong Road, two on Karrinyup Road, and one on South Street, Morley Drive and Guildford Drive.

An interim report in 2016 looking into the impact of the first four trial locations along Canning Highway estimated traffic flow in the area had improved by 24 per cent, with vehicles travelling westbound less impeded by red lights allowing opposing vehicles to turn right.