13. Number and Location of Light Units
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- Table of Contents
- Part A – Introduction
- Part B – Existing Grade Crossings
- Part C – New Standards
- Part D – Design Calculations
- Part E – Warning System Design
- Part F – Interconnected Devices
- Appendix A – Light Emitting Diode (LED) Signal Modules
- Appendix B – Limited Use Warning Systems
- Appendix C – Limited Use Warning Systems with Walk Light
- Appendix D – Whistling Cessation
13.0 Where incandescent lights are installed, the light unit voltage must be maintained between 90 and 110 per cent of the rated voltage under standby power conditions.
13.1 Light units must be installed in a warning system and located to ensure that the crossing user, on a road approach, or accessing a road approach:
- is within the effective distribution pattern of luminous intensity of a set of light units within the distances specified for the front light units within SSD; and
- is able to see at least one set of front light units clearly.
13.2 Except for when the visibility of units is obstructed by railway equipment, light units must be provided in a warning system and located to ensure that a crossing user in the stopped position at the grade crossing;
- is within the effective distribution pattern of luminous intensity of a set of back lights;
- so that at least one set of back lights is clearly visible to crossing users in each lane.
13.3 Cantilevered Light Units
13.3.1 Except on a one-way road where a second warning signal is installed on the left side of the lane, a cantilevered light unit must be provided in a warning system if:
- the distance between the centre of a warning signal mast and the edge of the lane of the road that is the farthest from the mast, measured perpendicular to the road, exceeds 7.7 m for DR, and 8.7 m for DL as shown in Figure 13-1;
- the front light units of the warning signal (i.e. those on the same side of the track as approaching traffic) are not clearly visible within the distance for the set of light units as specified in article 14.4.
13.3.2 Cantilevered light units must be installed for a warning system on a road that meets the specifications for an expressway as specified in Table 10-2.
13.4 Light Units for a Sidewalk, Path or Trail
13.4.1 A sidewalk, path or trail with a centre line more than 3.6 m (12 feet) from the centre of a warning signal mast must have separate light units for each direction of travel, as shown in Figure 13-2(a).
13.4.2 Lights must be installed for persons travelling in the direction opposite to vehicle traffic where there is a sidewalk, path or trail along a one-way road as shown in Figure 13-2(b).
Figure 13-1 – Warning Signal Offsets Requiring Cantilevered Light Units
(a) Two-Way Road
(b) One-Way or Divided Road
Figure 13-2 – Sidewalks, Paths and Trails
a) Two Way
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