Arrow Board

An arrow board is a portable electronic traffic control device that displays illuminated directional arrows, chevrons, or warning patterns to guide motorists through work zones, lane closures, and temporary traffic diversions. These devices use arrays of incandescent or LED lamps arranged in specific patterns to provide clear, visible guidance to approaching traffic. Arrow boards are classified by lamp count and pattern type, with larger arrays providing greater visibility for higher-speed roadways.

Modèles

13, 15, or 25 lamps

Lamp Count

Marques

Fonctionnement

Arrow boards use electronically controlled lamp arrays to display sequential or static patterns including left and right arrows, chevrons, double arrows, and caution modes. The controller cycles power through specific lamps in programmed sequences, creating the appearance of directional motion or warning patterns. Most units operate on battery power with solar panel charging, allowing extended autonomous deployment in traffic control applications. The device mounts on a trailer, truck bed, or stand, positioning the display panel at a height and angle visible to approaching traffic. Operators select display patterns via a control panel, typically offering 8-12 standard patterns including arrow directions, alternating displays, and flashing caution modes compliant with traffic control standards.

Types et variantes

Type B (13-Lamp): Minimum configuration for low-speed urban applications, displaying basic arrow and caution patterns for roads under 45 mph
Type B (15-Lamp): Standard configuration for general road work and lane closures on roads posted up to 45 mph, offering fuller pattern visibility
Type C (25-Lamp): High-visibility configuration for freeway and high-speed applications, providing legibility at distances exceeding one mile
Trailer-Mounted: Self-contained units on road-towable trailers with integrated power systems, battery banks, and solar panels for extended deployment
Truck-Mounted: Fixed or portable units designed for installation in pickup truck beds or vehicle-mounted frames for mobile operations

Spécifications clés

Spécification	Plage typique	Signification
Lamp Count	13, 15, or 25 lamps	Determines display size, pattern complexity, and MUTCD type classification (Type B or Type C)
Display Patterns	8–12 modes	Standard patterns include left/right arrows, double arrows, chevrons, alternating arrows, and caution/flashing modes
Visibility Range	0.5–1+ miles	Distance at which patterns remain legible; Type C units achieve maximum range for high-speed roadways
Power Source	12V DC battery with solar	Deep-cycle batteries recharged by solar panels enable multi-day autonomous operation without external power
Panel Dimensions	48–96 inches wide	Overall display width increases with lamp count; larger panels provide greater conspicuity at distance

Comment l'industrie le dimensionne

The industry sizes arrow boards primarily by lamp count, which determines both the physical size of the display and its classification under traffic control standards. Type B boards with 13 or 15 lamps suit low- to moderate-speed urban and suburban work zones on roads posted up to 45 mph. Type C boards with 25 lamps provide the visibility required for freeway and high-speed applications where approaching traffic travels at highway speeds, offering legibility at distances exceeding one mile. The lamp count directly correlates to pattern complexity, display area, and the range at which directional guidance remains clear to motorists.

Applications

Highway and freeway lane closures requiring advance warning and directional guidance at high approach speeds
Urban street work zones and utility projects with temporary lane shifts or closures on moderate-speed roadways
Road construction projects requiring traffic merging, splitting, or transitioning between temporary and permanent lanes
Special events and emergency detours where temporary traffic pattern changes require clear directional communication
Mobile maintenance operations such as striping, pothole repair, or sweeping with moving work zones
Intersection closures and detours requiring motorists to navigate alternative routes around construction areas

Sécurité et opération

Position boards at appropriate advance distances per MUTCD guidelines based on road speed and sight distance to provide adequate reaction time
Ensure stable mounting or trailer positioning on level ground with wheel chocks and outriggers deployed to prevent tipping in wind
Verify display patterns match actual traffic control setup; incorrect arrows directing traffic into closed lanes create hazard conditions
Maintain clear sight lines to the display panel by avoiding placement behind curves, crests, or obstructions that reduce visibility
Monitor battery charge levels and solar panel function to prevent display failure during active traffic control operations

Normes et certifications

MUTCD · Part 6: Manual on Uniform Traffic Control Devices specifies arrow board types, placement, patterns, and applications for temporary traffic control
NCHRP 350: Crash testing standards for work zone devices; trailer-mounted units may require crashworthy designs or shielding in certain placements
ITE: Institute of Transportation Engineers provides supplemental guidance on work zone traffic control device deployment and visibility
SAE J595: Defines directional flashing and sequential lighting standards applicable to arrow board lamp sequencing and flash rates

Questions fréquentes

What is the difference between Type B and Type C arrow boards?

Type B boards (13 or 15 lamps) are designed for roads with speeds up to 45 mph and provide adequate visibility for urban and suburban work zones. Type C boards (25 lamps) offer greater visibility at distances exceeding one mile, making them suitable for freeway and high-speed highway applications where traffic approaches at 55 mph or higher.

How long do arrow boards operate on battery power?

Operating duration depends on battery capacity, solar charging conditions, and display mode. Most trailer-mounted units with solar panels and deep-cycle batteries operate continuously for 5-10 days under typical conditions. Flashing modes consume less power than fully illuminated patterns, extending battery life during deployment.

Which display pattern should be used for lane closures?

The appropriate pattern depends on the traffic control setup. Directional arrows (left or right) guide traffic into open lanes during merges. Chevron patterns indicate lane closures ahead without specifying direction. Double arrows warn of lane shifts or splits. Caution/alternating modes provide general warning without directional guidance. Pattern selection must match the MUTCD-compliant traffic control plan.

Can arrow boards operate in all weather conditions?

Arrow boards are designed for outdoor deployment in rain, snow, and wind, with weather-resistant enclosures protecting electronics and lamps. However, heavy snow accumulation on solar panels reduces charging, and extreme winds may require additional stabilization or temporary shutdown. LED lamp technology performs reliably across temperature extremes compared to incandescent lamps.