Don’t remember any tarmac bits from last year.
(suspect you’re thinking of the MEGAvalanche rather than MACavalanche)
Assuming it follows similar to prior years, each stage will use the red downhill trail. Last year was
S1 = Started just along from the Cliffhanger chair. Fast descent across open hillside, then a pretty disgusting climb up to the top of Creag Dhubh. From there descend to the top of the access chair then down the red downhill trail
S2 = Back up the cliff hanger but this time starting from the other side. Basically following mugs alley ski route down to the access chair and back down the red DH
S3 = Up the cliffhanger again then climb/ push/ carry for 45-50 minutes. Mass start on snow (hopefully) broadly following the same route as S1 with that horrible climb again. Last year on the final descent down the red DH, they took us off piste down some open hillside with bike swallowing bogs etc.
great fun