A man was seriously injured by a car in an accident which caused gridlock in Uxbridge town centre.
The 61-year-old man was hit by an Audi TT Quatro on Saturday near Beasleys Yard in High Street, Uxbridge.
The street plus Harefield Road and Bakers Road were cordoned off shortly after the incident at 10.16am.
James Mole, company secretary at Boville's Art Shops in High Street, said: "I saw he was lying in the road and paramedics had just arrived and were running up to him.
"I've got a feeling he may have been in here before with a young boy.
"Police taped the road off and they were preventing people from using the pavement for about an hour and a half.
"Then I spoke to police and we came to an arrangement. We were down about £200 (takings)."
Mr Mole added: "We just hope he is OK, especially seeing as he may have been a customer."
Huge disruption was caused to traffic as roads remained closed for more than six hours.
Businesses also reported fewer customers coming through the doors and lower takings.
Tim Johnson, manager of S H Harold opticians in High Street said: "A couple of patients cancelled. The traffic was disrupted and people couldn't come into town very easily.
"I've phoned the council before with a view to get a 20mph speed limit on the road.
"With the parked cars it's not very easy to see and it's a very busy area."
Manager of The Crown and Sceptre pub, Lisa Baran, said business was quiet.
She said: "Some customers may not have realised they could access the pavement.
"If people saw it earlier on they would have thought they couldn't come in."
The pensioner was taken to Hillingdon Hospital with leg, wrist and head injuries where his condition was believed to be serious but not life threatening.
Five bus routes were diverted until all the roads were re-opened around 5pm.
* A 24-year-old woman has been arrested on suspicion of failing to stop at a traffic accident and bailed pending further investigation until October.