A cross slope of 1 percent typically provides adequate conveyance of drainage;

Sloping bikeways in one direction instead of crowning is preferred and simplifies drainage and surface construction;

Bikeways retrofitted within a road corridor may be located within existing slope and drainage patterns of the respective roadway to minimize changes to the roadway’s drainage system;

Drainage grates should be located outside the bikeway whenever practical (e.g., placed entirely within a gutter next to a bike lane) to minimize a reduction of the usable width of the bikeway; and

Drainage grates that extend into a bikeway may cause bicyclists to swerve increasing crash risks. Where this is unavoidable, to minimize crash risk the following should be considered;

Guide bicyclists around the grate with pavement markings (see
Section 18.3.6
and refer to the
TMUTCD
); and
Install bicycle friendly drainage grates which meet the following parameters:
Skid resistant to prevent a crash hazard;
Align grate openings perpendicular to the bicyclists’ direction of travel (see
Figure 18-10
);
Limit the gap between the grate and frame to 0.5 inch or less, perpendicular to the path of travel; and
Grates should remain smooth and flush with the bikeways surface.