Visibility & Lighting

The visual conditions of driving: roadway and vehicle lighting, glare, conspicuity, sign legibility, and the low-light visual capabilities they depend on.

What's here. Photometric and field measurement of roadway lighting effects, headlamp performance, and adaptive driving beam, with glare separated into disability glare and discomfort glare. Also the visual capabilities that low-light driving draws on (dark adaptation mesopic, contrast sensitivity) and detection-distance work on sign visibility legibility, vehicle conspicuity, vru conspicuity, and emergency work zone conspicuity.

What isn't here.

• conspicuity of motorcycles and their riders (motorcycle_conspicuity) — Two-Wheeler & Motorcycle Drivers. vehicle_conspicuity and vru_conspicuity here cover cars, trucks, work crews, and pedestrians. Work framed around the motorcycle as a vehicle type is shelved with the rider population instead, so a conspicuity search will return hits in both places.
• visibility and conspicuity analysis performed for a specific crash or case — Forensic Human Factors. visibility_analysis_litigation and conspicuity_in_litigation live there, alongside perception_reaction_time. This category holds the underlying measurements; that one holds their application to casework. It is the heaviest overlap in the corpus.
• fog, rain, and snow obscuration, work zone layout, and roadside signage treated as road environment — Environment, Road & Weather. weather_rain_fog_snow, work_zones, and signage_environment are the sibling category in the same area. The dividing line: light sources and the eye here, atmosphere and road furniture there. Sign legibility as a luminance and retroreflectivity problem stays here.