Owners of Rome's motorbikes, mopeds and scooters that were registered in 1993 or before are hurrying to obtain a certificate called a bollino blu to state that their vehicles emit acceptable levels of gas. If they don't have the little sticker by 31 Jan 2004 their machines may be banned from the roads. More than 150 garages across the city are conducting pollution checks on exhausts, which should take no more than 20 minutes and cost 7.75. Owners of two-wheeled vehicles registered in 1994 have until 28 Feb, those registered in 1995 have until 30 April, those in 1996 until 31 Aug, and owners of a 1997 registration have until 30 Nov. Bollini blu are not needed on 1998-2004 registered machines until 1 Jan 2005. The certificate lasts for a year and should be kept with the bike at all times. Some 600,000 motorbikes, mopeds and scooters are driven in Rome. The city's council is the first in Italy to make the certificates compulsory for two-wheeled vehicles; the regulations have applied to cars since 1998. To find the nearest garage authorised to conduct an exhaust test or for more information, tel. 060606 or see www.aceaspa.it or www.comune.roma.it/ambiente.