3-018 Shared Use Trails, Paved Tread, Double Track 3-019 Shared Use Trails, Natural Tread, Double Track 3-020 Limited Use Trails, Paved Tread, Single Track 3-021 Bikeways. Section 4-000 Channelization. 4-001 Channelization Details 4-002 Refuge Islands. Section 5-000 Roadside Appurtenances. 5-001 Clearance of Roadside Obstacles on Shoulder Type Road