The Traffic Signs Regulations and General Directions 2002 came into force on 31 January 2003, replacing the 1994 version. Full text and illustrations at: http://www.legislation.hmso.gov.uk/si/si2002/20023113.htm
The Department for Transport published a leaflet explaining new road markings and signs, including Advanced Stop Lines. The leaflet stated:
"Where a cycle reservoir has been marked out at traffic signals at a junction, all vehicles MUST stop at the first stop line reached unless the signal is green, or the vehicle cannot be safely stopped for an amber signal. Pedal cycles may use the approach cycle lane to enter the reservoir without crossing a stop line. Motorcycles MUST NOT use the approach cycle lane to enter the reservoir while a red signal is showing even if the cycle lane is an advisory one rather than a mandatory one."
Members of Westminster Cycling Campaign have now surveyed several junctions four times since 2002, the latest being in April 2009.
The results of the 2009 survey showed that:
Some drivers stop at advanced stop lines;
...others don't.

In the past few years, highway authorities have invested quite a lot of money in advanced stop lines. Although they are not a panacea, they can make cycling through London a lot easier if they are properly designed. But their effectiveness is very much reduced by the minority of motorists who disregard them.
"TfL has pioneered the introduction of a BTEC qualification for bus drivers in London. As part of the qualification drivers will be reminded of accurate stopping distances from junctions. This new qualification will be applied to all new drivers from September of this year [2002], and bus operators are also being encouraged to train [existing] staff to the same level.
"Thank you for your suggestion of a campaign to remind bus drivers to stop correctly at junctions. As you will be aware, we place posters on the back of buses concerning many important matters. I will make sure that your suggestion is considered as part of our ongoing review of new poster requirements.
"I will also talk to the Public Carriage Office regarding issuing advice to taxi drivers. TfL hold regular meetings with the taxi industry and it may be relevant to mention this issue at one of these."
| Year | Cars | Motor cycles | Vans + Lorries | Taxis | London Buses | All Vehicles |
| 2009 | 65% | 31% | 70% | 54% | 92% | 53% |
| 2005 | 65% | 24% | 79% | 51% | 83% | 51% |
| 2003 | 79% | 19% | 71% | 63% | 73% | 60% |
| 2002 | 60% | 30% | 54% | 58% | 59% | 53% |