Vehicles in the 5th Category are required to comply with one of the following requirements in regards to safety cages:

	Ja, Ka, Lb	Group N*	Group S*	All other groups	Form required
No safety cage required unless originally fitted	Yes1				Written request to Motorsport Australia
Safety cage to comply with 1973 requirements SPECIFICATIONS OF AUTOMOBILES 5th Category – Historic Cars Vehicle Eligibility – General Requirements	Yes			Yes ^	No form
Safety cage to comply with Schedule J of the Motorsport Australia Manual SPECIFICATIONS OF AUTOMOBILES 5th Category – Historic Cars Vehicle Eligibility – General Requirements	Yes	Yes Type 2 or 3	Yes Type 2 or 3	Yes^	Safety Cage Registration forms (Type 1, 2 and 3)
Safety cage to comply with SPECIFICATIONS OF AUTOMOBILES 5th Category – Historic Cars Vehicle Eligibility – General Requirements	Yes				Historic Safety Cage Authorisation form

Refer to the SPECIFICATIONS OF AUTOMOBILES 5th Category – Historic Cars Vehicle Eligibility – General Requirements or the relevant vehicle requirements of the 5th Category Regulations for more information regarding the safety cage requirement for your vehicle

¹Effective roll bars must be fitted to all competing vehicles, however Group Ja, Ka and Lb vehicles, which cannot be so equipped without serious adverse impacts on standards of authenticity and originality may be exempted from the requirement. Any exemption from the requirement to fit roll bars must be sought from and approved by Motorsport Australia.

*For the following groups refer to the Groups Na, Nb, Nc, C, A, Sa, Sb and Sc - refer individual group regulations for more information regarding the safety cage requirement for your vehicle.

^Some vehicles may not be able to comply with Schedule J or the 1973 requirements and may be eligible to apply for consideration to be granted permission to install a safety cage that complies with SPECIFICATIONS OF AUTOMOBILES 5th Category – Historic Cars Vehicle Eligibility – General Requirements

To establish that a vehicle has a continuous line of history, even though following major damage, it may have undergone substantial repair or replacement at some time in its competition history, it will be necessary to establish what if any major components have been replaced and/or discarded. Usually this will be the tube chassis-frame, monocoque or body shell. If no major components have been replaced and have simply undergone major repairs, then the line of history is unbroken and will not be the subject of the guidelines below.

Note: these guidelines are for individuals to consider before making an application for vehicle certification.

1. Was the level of damage, or deterioration so severe that the original components had to be replaced? Inspection or proof of the condition of the replaced component is required, as is proof of the fate of the replaced and/or discarded components.

2. Did the new components provide minimal change to the specification of the rebuilt vehicle? The vehicle must have been rebuilt to essentially the same basic specification as prior to the replacement and incorporate as many of the original distinguishing components as possible. Proof of the original specification required.

• Was the intent of the rebuild an attempt to get the vehicle back into competition as soon as possible?
• And if so, how long was the vehicle out of action because of the component replacement/vehicle rebuild – was it less than 3 months?

Note: If the answers to Questions 1 and 2 were in the affirmative then the original vehicle would likely retain its Line of History.

3. Were the major component/s replaced as a method of upgrading the specification of the original vehicle?

Note: If the answer to this question is affirmative, then it will likely require more detailed investigation depending on the extent of the replacements and the level of the upgrade. The rebuild could effectively constitute the construction of a new vehicle, in which case the “year the vehicle represents” may now start from the date of the completion of the replacement vehicle.

4. Were the discarded major component/s sufficiently significant or different to represent the original vehicle and confirm its unique identity?

Note: If the answer to this question is affirmative then there is likely to be a case for restoring/resurrecting the original vehicle with its history extending from the date of manufacture to the date of the event that resulted in it being withdrawn from active competition.

5. Were the discarded major component/s used to create another vehicle?

Note: The answer to this question will depend on the timing of the “creation.” If it took place in one of the existing historic periods then the vehicle will have a claim to the specification at that time. However under Motorsport Australia's 5th Category regulations it isn’t acceptable to create a new historic vehicle. It is acceptable to use a discarded but repaired chassis to repair another damaged vehicle provided the process is accurately recorded and the chassis number of the repaired vehicle is retained.

6. Did the rebuilt vehicle retain the original documentation/log book?

7. Was there a change of ownership following the rebuild?

8. How long was the vehicle out of action because of the component replacement – was it more than 12 months?

Note: The answers to Questions 6, 7 and 8 will assist in determining the circumstances and timing of the rebuild. Logbooks did not have the significance “in the day” that they do now, and questionable documentation in the past can create problems when historic classification is being sought.

If you wish to change the ownership of a historic log book, please complete a log book amendment form and send this and the log book to Motorsport Australia for processing. If is not necessary to submit Certificates of Description for change of ownership.

If you have changed the colour of a vehicle with a historic log book, you will need to submit the log book, new photos and a log book amendment form to Motorsport Australia. In the case of vehicles with a COD, an 'Erratum' document will be issued.

There is no fee for this service. Photos can be emailed to [email protected]

Please allow 5–7 working days for the changes to be processed.

Please note: If you wish to make changes in specification or colour to a vehicle with a COD, we recommend that you contact Motorsport Australia on 1300 883 959 for approval prior to making any modifications.