Police were called at approximately 6.50pm on Friday, 5 November following reports of a man assaulted in Park Lane, W1.
The incident happened following an altercation between the occupants of two vehicles; the victim – a man believed aged in his 20s – had a substance sprayed in his face.
London Ambulance Service attended the scene and treated the man before he was taken to the hospital. His condition is not life-threatening.
Road closures remain in place on the northbound section of Park Lane.
No arrests; enquiries into the circumstances are ongoing.
Anyone with information that could assist is asked to call police on 101 or tweet @MetCC and quote CAD6591/5Nov.
Alternatively, contact the independent charity Crimestoppers anonymously on 0800 555 111.