MUTCD Section 2B.68 specifies gate arms must be retroreflective with what pattern?

MUTCD Section 2B.68 specifies gate arms must be retroreflective with what pattern?

• A. Fully retroreflectorized on both sides with vertical red and white stripes at 16-inch horizontal intervals.
• B. Only backward-facing stripes.
• C. Single color reflective.
• D. No reflective requirement.

Answer: (A)

The important point here is ensuring gate arms are highly visible from both directions and under night conditions. The standard requires that gate arms be fully retroreflectorized on both sides and display vertical red and white stripes spaced at 16-inch horizontal intervals. This combination creates strong, recognizable contrast in daylight and reflects headlights at night, making the warning clear to drivers approaching from either direction. The full coverage on both sides prevents obscuration from viewing angle, and the repeating vertical stripes give a quick, distinct pattern that signals a barrier ahead. Other patterns wouldn’t offer the same reliable two‑way visibility or the same level of conspicuity, which is why only this pattern meets the requirement.

The important point here is ensuring gate arms are highly visible from both directions and under night conditions. The standard requires that gate arms be fully retroreflectorized on both sides and display vertical red and white stripes spaced at 16-inch horizontal intervals. This combination creates strong, recognizable contrast in daylight and reflects headlights at night, making the warning clear to drivers approaching from either direction. The full coverage on both sides prevents obscuration from viewing angle, and the repeating vertical stripes give a quick, distinct pattern that signals a barrier ahead. Other patterns wouldn’t offer the same reliable two‑way visibility or the same level of conspicuity, which is why only this pattern meets the requirement.