Section 4: Barrier ReflectorsAnchor: #i1004079
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.Anchor: #i1004089
Barrier Reflector Design
Various types of barrier reflectors may be used to mark guardrail, bridge rail, or concrete barrier. Figure 8-9 indicates some of these devices.
Figure 8-9. Barrier ReflectorsAnchor: #i1004109
Barrier Reflector Application
Barrier reflectors are used on guardrail, bridge rail, or concrete barrier. If used, the following guidelines apply:
- Barrier reflectors do not replace required (shall) or recommended (should) delineation.
- Barrier reflectors can be used in place of optional (may) delineation.
- Barrier reflectors can be used in combination with delineators.
- Continuous bi-directional (two-way) barrier reflectors or delineation should be provided along roadside barriers for two-way roadways. For one-way and multilane roadways, barrier reflectors can be uni-directional (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 8-10),
- On top or on the side of concrete barrier (see Figure 8-10), 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 8-10. Typical Barrier Reflector InstallationAnchor: #i1004179
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. When barrier reflectors are used along a curved section, Table 8-2 should be used to determine the appropriate barrier reflector spacing up to a maximum of 100 ft. Barrier reflectors may not be used to replace delineators on freeway or expressway curves. Figure 8-11 illustrates barrier reflector spacing.
Figure 8-11. Barrier Reflector Spacing