* The machine may also move back slightly as the rider regains momentum.
* No penalty for TOUCHING tape or Section Cards
* NOTE! Clubs may adopt their own marking rules, any changes should be stated on the entry sheet or the signing on sheets
* A machine will be deemed to be in the section when the front wheel has passed the Section Begins card and marks will be awarded until the back wheel has passed the Section Ends card.
* 13 to 15 year olds - Maximum 250cc
but that said, having read it a few times, i would say that it is "stop permitted" rules (TSR22A in ACU speak) as i can't see a rule saying "ceasing forward motion is a failure"
rabie's post in Non-Stop Self Marking was marked as the answer