A case to look through
Traffic
What does a driver have to perceive for coordinated movement to be possible?
Traffic coordination depends not only on rules or goals but on drivers encountering the road as structured by lanes, signals, rights of way, hazards, openings, and possible movements.
Start with the puzzle
The road is not just a collection of physical objects.
For a driver, a red light is not merely a colored object. A lane marking is not merely paint. A gap in traffic is not merely empty space.
These features organize action: stop here, remain within this region, yield to that movement, this opening is usable, that pedestrian changes what should happen next.
Traffic therefore depends on participants picking up enough of the same action-relevant structure for their trajectories to remain compatible.
Try looking at this case through
Perceptual / relevance alignment
Drivers must detect the distinctions that make appropriate action intelligible.
How it happensMaking differences actionable
Signals, markings, signs, visibility, and learned conventions turn environmental differences into changes in behavior.
LensConcordance
Drivers need compatible trajectories, not shared destinations or values.
LensInstitutional alignment
Rules and conventions structure which movements count as permitted or expected.
Try breaking it
Keep the rules. Remove their perceptual availability.
Imagine every driver sincerely endorses the traffic rules but cannot see lane markings, identify the active signal, detect pedestrians, or distinguish a permitted turn from a prohibited one.
The rules have not changed. The values have not changed. Yet much of the coordination machinery has disappeared.
Look again