Curves should be banked with the low side on the inside of the curve to help bicyclists maintain their balance. The greatest conflicts occur where paths cross freeway entrance and exit ramps. When grade separation structures cannot be justified, signalization or other measures should be considered to reduce conflicts. Good sight distance must be provided so vehicle drivers can see approaching path users. Undercrossings should be visually open for the personal security of users.
Illumination is needed in areas of poor visibility.
If the roadway is elevated, an undercrossing can be constructed with little or no grade. They are often less expensive to build. They may present security problems, due to reduced visibility. They may require drainage if the sag point is lower than the surrounding terrain. This can be lessened if the road is built in a cut section.