If they stay single file and stay to the right I have no problem with 'cyclists'. But on the BRP, when they are in a group, they like to ride side by side (not all but a significant number do). The problem with the parkway, unless you can see through the apex, there's always the possibility of something being around the corner so typically the group I ride with (Between the Sheetz gang), rides during the week instead of weekends and holidays. Less stressful that way and we have few issues with 'cyclists', motor homes, sight seeing cages, cruisers, and rangers (have had a few flash their lights at me...I wonder why?).