Here is the route as promised and to make yourself familia with where we will likely need some marshals.
1 @ the Ferry terminal area ( a couple should be suffice)
2 @ the turning into the harbour area (another couple)
3 @ the turn point for home
Basically your job is to control the runners as they pass the hazard areas, ie the junctions in and out, and stop if necessary the runners crossing the road, for one has not got the authority to stop the cars.