A collision at the Imperial Drive and Farm Avenue junction in West Harrow led to a roadblock for northbound traffic this morning.
The incident occurred at around 05:49am this morning and resulted in one man being arrested.
A spokesperson for Met Police said: “Police were called to Imperial Drive, Harrow at about 05:31hrs on Saturday 19 August following reports of a collision.
“The male driver was arrested on suspicion of being drunk in charge of a vehicle.
“He has been taken to hospital for treatment. His injuries are not believed to be serious.
“Enquiries are ongoing.”