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R305.2.1 Perpendicular Curb Ramps.
    On perpendicular curb ramps, detectable warning surfaces shall be placed as follows:


      1.    Where the ends of the bottom grade break are in front of the back of curb, detectable warning surfaces shall
         be placed at the back of curb.
      2.    Where the ends of the bottom grade break are behind the back of curb and the distance from either end of
         the bottom grade brake to the back of curb is 1.5 m (5.0 ft) or less, detectable warning surfaces shall be placed
         on the ramp run within one dome spacing of the bottom grade break.
      3.    Where the ends of the bottom grade break are behind the back of curb and the distance from either end of
         the bottom grade brake to the back of curb is more than 1.5 m (5.0 ft), detectable warning surfaces shall be
         placed on the lower landing at the back of curb.

    R305.2.2 Parallel Curb Ramps.
    On parallel curb ramps, detectable warning surfaces shall be placed on the turning space at the flush transition
    between the street and sidewalk.


    R305.2.3 Blended Transitions.
    On blended transitions, detectable warning surfaces shall be placed at the back of curb. Where raised pedestrian
    street crossings, depressed corners, or other level pedestrian street crossings are provided, detectable warning
    surfaces shall be placed at the flush transition between the street and the sidewalk.

    R305.2.4 Pedestrian Refuge Islands.
    At cut-through pedestrian refuge islands, detectable warning surfaces shall be placed at the edges of the pedestrian
    island and shall be separated by a 610 mm (2.0 ft) minimum length of surface without detectable warnings.

    R305.2.5 Pedestrian At-Grade Rail Crossings.

    At pedestrian at-grade rail crossings not located within a street or highway, detectable warning surfaces shall be
    placed on each side of the rail crossing. The edge of the detectable warning surface nearest the rail crossing shall be
    1.8 m (6.0 ft) minimum and 4.6 m (15.0 ft) maximum from the centerline of the nearest rail. Where pedestrian gates
    are provided, detectable warning surfaces shall be placed on the side of the gates opposite the rail.


    R305.2.6 Boarding Platforms.
    At boarding platforms for buses and rail vehicles, detectable warning surfaces shall be placed at the boarding edge of
    the platform.

    R305.2.7 Boarding and Alighting Areas.
    At boarding and alighting areas at sidewalk or street level transit stops for rail vehicles, detectable warning surfaces
    shall be placed at the side of the boarding and alighting area facing the rail vehicles.
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