Motorists faced lengthy queues on their way into work after 1,000 litres of an unknown chemical was spilled across a busy Solihull road yesterday.
Rush hour commuters were hit with delays of at least 30 minutes after a lorry shed three containers of a potentially harmful substance.
The spillage happened on the southbound carriageway of the A446 close to the exit for Junction 4 of the M6 near Chelmsley Wood, Solihull.
No one was injured.
The A446 was shut between the M6 and Junction 9 of the M42 at Curdworth, near Sutton Coldfield, immediately after the leak at about 4.45am yesterday.
Its northbound carriageway was reopened at about 6.30am.
The southbound route remained closed until midday while specialists from Warwickshire Fire Service cleared the road.
Both WFS and Warwickshire Police were unable to confirm what the chemical was.