Stream Simulation Design Process - USDA Forest Service

Know your traffic needs!
Bypass roads – adding later may require structure modification,
$$$ So Plan Ahead, NEPA, fire access, recreation
• By pass roads are most suitable for Forest roads or Country roads where
land is available for temporary construction & public traffic use.
• Highway designs often require 24/7 traffic.
•No bypass road but maintaining traffic usually requires construction of a
long structure and the use of retaining wall to separate construction
elevation from traffic elevation.