Formula One will now impose a curfew on team personnel in order to reduce their working hours at the circuits. The rule now reads as follows
30.19 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.
However, each team will be permitted four individual exceptions to the above during a Championship season.
courtesy of www.fia.com