St. Peters, MO Outdoor Lighting: Billboard Lighting (2026)

Section 405.765(D)(1) of the St. Peters Municipal Code sets the lighting standards that apply to every billboard permitted along the City's I-70 and Route 94 corridor. The general lighting rule bars any sign that resembles or interferes with an official traffic control device, railroad sign or signal, and requires illuminated signs to be built so they avoid glare or reflection onto an adjacent highway or nearby residential buildings; no flashing or rotating flashing illumination is allowed on any billboard. For electronic billboards specifically, Section 405.765(D)(1)(a)(4) sets a hard numeric ceiling: no more than 5,000 nits, measured in candelas per square meter, during daylight hours, dropping to no more than 300 nits between dusk and dawn, both measured from the sign's face at maximum brightness.

Section 405.765(D)(1)(a)(6) backs that ceiling with a hardware mandate: every electronic graphic display sign must carry an automatic dimmer control that produces a distinct step down in illumination from the higher daylight level to the lower dusk-to-dawn level. Section 405.765(D)(1)(a)(5) separately forbids any billboard from fluctuating in light intensity or using intermittent, strobe or moving light, or light that changes intensity in sudden bursts, streams, zooms, twinkles or sparkles, closing off workaround lighting effects that could otherwise dodge the brightness cap. Audio speakers are barred from any billboard installation as well.