From Thursday 13 January, and on every succesive Thursday for 12 weeks, private traffic on the city roads within the GRA, the city ring road, will be restricted according to number plate as a way of cutting down smog in the city. On the first Thursday cars which have a number plate ending with an even number will not be allowed to circulate and on the following Thursday those whose number plates end in an odd number will not be permitted, and so on. The restriction will be in force from 09.0012.00 and from 15.0019.00. If the smog persists in Rome it is possible that no cars will be allowed on the roads on Sunday 16 January.