Intelligent · Illuminated · Modular
RADROAD‑APEX
Built for all MUTCD regulatory, warning, and guide signs. Reverts to a standard retroreflective sign if power fails.
APEX I Alpha Unit, R1-1 STOP. See photos and video
Intelligent · Illuminated · Modular
Built for all MUTCD regulatory, warning, and guide signs. Reverts to a standard retroreflective sign if power fails.
APEX I Alpha Unit, R1-1 STOP. See photos and video
Our mission
Radiant Roadways, Inc. is a Colorado company on a mission to save lives by reducing roadway incidents through the development of durable, intelligent, American-made infrastructure.
Internally illuminated. Even, uniform luminance across the entire sign face. Legend legible at ≥ 500 ft. Learn more →
Radar detection triggers on approaching vehicles. Configurable zones. Day and night. Learn more →
Cellular telemetry. Battery SoC, temperature, luminance retention, tamper alerts. Learn more →
Aluminum chassis · Polycarbonate face · Designed to IP65, –40°F to +135°F and 150 mph wind (AASHTO LRFDLTS-1)
APEX I Alpha Unit, standard STOP sign behind. See photos and video
In a Texas A&M Transportation Institute closed-course study of nine sign treatments, internally illuminated legends posted the largest legibility gains and were the most favored by participants.
Sources: Texas A&M TTI closed-course LegendViz study, commissioned by TAPCO (2021) · RADROAD-APEX I sales specification (legibility target)
See the full evidence →Designed and engineered to conform with the technical safety requirements of UL 48, Standard for Electric Signs. * Designed to meet FCC Part 15; emissions testing planned for late 2026.
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