14.7. The Course Closed Signal must be red and if it is a light must be fitted with at least two bulbs. The Course Clear Signal must be green.
14.8. For Drag Racing two separate performances are monitored for each run, the elapsed time and the speed. On an elapsed time run the Vehicle first leaves the starting line connecting the beam which activates the electronic timer. As the Vehicle continues through the course the timer records the elapsed seconds and fractions of seconds until the Vehicle breaks the finish line beam and stops the timer. Top speed is determined by the Vehicle breaking one additional light beam at the Finish Line.
15. Alignment Lights
15.1. Where alignment lights are used they must be in a separate housing and can be of any colour except red or green. When Course conditions require a repeater of the Course Clear Signal can also be incorporated in this housing.
16. Autocross and Rallycross Events 16.1. The start timing should be synchronised with the starting Signal and not activated by a light beam.
17. Rallying Events
17.1. Where times are recorded to the minute a timepiece with an accuracy validated against GMT / BST Time is permitted( Chapter 13).
18. Timing Equipment
18.1. All timing equipment used at any ASN Permit Event must have a licence plate attached and proof of current certification must always be available( except for Interclub or Clubman non-Speed Event competitions when this requirement only applies if specifically detailed in the discipline Specific Regulations). Part A Appendix 18 Chart 2 identifies which Events require certified timing equipment.
18.2. For Stage Rallies the Chief Timekeeper must provide the ASN Steward( or send to the ASN within seven days) a standard report form listing the certificate numbers, serial numbers and names of the suppliers of the clocks being used.
18.3. Any Laser equipment must have ASN approval before use.
18.4. Adequate warnings must be displayed that a laser beam is being used and precautions taken to prevent any person looking directly into the beam.
19. Timing Equipment – Classification and Certification
19.1. It is mandatory for all timing equipment used to establish and publish times at ASN Permit Events to be of a type which has a current ASN Certificate of Approval for Use and to be tested and certified in accordance with Part A Appendix 18 Chart 6.
19.2. Detailed specifications for all classes of approved equipment are available from the ASN Technical Department or any member of the ASN Equipment Test Panel with whom new purchasers or builders of equipment are advised to make contact. Specifications detailing the use of laser equipment are available from the ASN Technical Office.
19.3. To obtain an ASN Certificate of Approval for Use and Certificate of Accuracy equipment must be submitted for test to any member of the ASN Test Panel in a complete form and as normally used including any remote operating devices.
19.4. ASN Certificates of Accuracy will only be issued to custodians of equipment irrespective of ownership.
19.5. The ASN Test Panel for class E / A E E / B E / C F and R equipment is maintained by the ASN Technical Office and details of the current panel are available on request.
Motorsport UK 2025 National Competition Rules Version 11
Chapter 5 Part A Appendix 7- Timekeepers and Handicappers 170