Mechanics working in the FIA Formula One World Championship will be subjected to new restrictions from 2011, it has been decided.

Under the F1 2011 Sporting Regulations, which were published by the FIA this week, working hours have been limited.

This will mean overnighters are no longer permissible, although each team will be allowed four exceptions.

"No team personnel who are associated in any way with the operation of the cars are permitted within the confines of the circuit during two six hour periods which commence ten hours before the scheduled start times of P1 and P3," the FIA said under the heading 'General Safety'.

"However, each team will be permitted four individual exceptions to the above during a season."