Section 4: Barrier Reflectors
Introduction
Barrier reflectors (BR) are retroreflective devices used to
inform motorists of the presence of a guardrail, bridge rail, or
concrete barrier adjacent to the roadway during nighttime conditions.
Barrier Reflector Design
Various types of barrier reflectors may be used to mark guardrail, bridge rail, or concrete barrier. Figure 8-13 indicates some of these devices.
Figure 8-13. Barrier Reflectors
Barrier Reflector Application
Barrier reflectors are used on guardrail, bridge rail, or
concrete barrier.
Continuous bi-directional (two-way) barrier reflectors or
delineation should be provided along roadside barriers for two-way
two-lane undivided roadways. For one-way and multi-lane roadways,
barrier reflectors can be unidirectional (one-way).
Barrier Reflector Placement
- If used, barrier reflectors should be placed in one of the following locations:
- In the depressed center section of a W-beam guardrail (butterfly type retroreflective device, see Figure 8-14),
- On top or on the side of concrete barrier (see Figure 8-14), or
- On guardrail/bridge rail posts or blockouts.
- Barrier reflectors should be installed a minimum of 18 inches above the edge of the pavement surface. Consistent barrier reflector height along the barrier is desired.
Figure 8-14. Typical Barrier Reflector Installation
Barrier Reflector Spacing
When used on straight sections of roadway, the spacing between barrier reflectors should be adjusted to ensure a minimum of three barrier reflectors are used, with a maximum spacing of 100 ft between any two barrier reflectors on guardrail or bridge rail. When barrier reflectors are used along a curved section, Table 8-3 or 8-4 should be used to determine the appropriate barrier reflector spacing up to a maximum of 100 ft. Figure 8-15 illustrates barrier reflector spacing.
Figure 8-15. Barrier Reflector Spacing