OFFS, first it was Montoya who got taken out by a draincover,
now this?! 
(Extracted from A1GP.com)
Following overnight modifications to the Jingkai street circuit,
the A1GP World Cup of Motorsports inaugural Beijing race weekend
got underway today with the third official practice session. After
25 minutes of action, the 90-minute long
session was suspended following a red flag resulting from a manhole
cover coming loose on the racing line between turns three and
four.
The aerodynamics of the A1GP car creates an extreme suction effect,
pinning the cars to the track during high speed racing.
The manhole lids had been welded to the
rim, utilising a method that would cause less damage to the
existing infrastructure, however the force of the suction proved
too strong, fracturing the welding and loosening the lid.
The remainder of the practice session and this afternoons four
qualifying sessions have been cancelled while work is undertaken to
secure all the manhole covers on the circuit.
A proven method used during the Durban street race back in January
this year will be used to secure the manhole lids. Bolts will be
drilled into the gap between the manhole lid and rim and screwed
into place, locking the 15 kilo lid into place. Silicon seal with
then be injected around the bolt to ensure it is securely
positioned. The work will be carried out this afternoon and the
A1GP cars are expected back on track tomorrow.
With the cancellation of all four
qualifying sessions, the grid for tomorrows sprint race will be
determined by the fastest lap times set in todays practice
session. All A1 Teams will be given an extra session on track ahead
of tomorrows Sprint race.
It's worked in our favour though...Murchison starts 17th, just
behind Malaysia's Alex Yoong, and ahead of Nicolas Lapierre
(France). 
