Interim Approval for Optional Use of an Intersection Bicycle Box (IA-18) Attachment 1 Long Description

This figure shows an example of an intersection bicycle box installed at the front of an approach to an intersection. For purposes of this description, it is assumed that north is upward in the figure.

The northbound approach is comprised of a shared through-left lane, a bicycle lane, and an exclusive right-turn lane. The right-turn lane is added shortly before the intersection. A BEGIN RIGHT TURN LANE – YIELD TO BIKES (R4-4) sign is placed at the upstream end of the taper for the right-turn lane and MUTCD Section 9B.05 is cited for placement details. A RIGHT LANE MUST TURN RIGHT (R3-7R) sign is placed at the downstream end of the taper at the point where the right-turn lane is fully established and MUTCD Section 2B.20 is cited for placement details. The bicycle box is installed in front of the through-left lane only. A dimension placed to the right of the bicycle box indicates that the depth of the box perpendicular to the cross street is a minimum of 10 feet. The stop line nearest the cross street is noted as the Intersection Stop Line and the stop line behind the bicycle box is noted as the Advance Stop Line.

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