No one builds a cairn alone.
A cairn is a stack of stones placed by many hands to make a difficult way easier to read. One traveler marks the route. Another strengthens it. In time, people who may never meet create something useful for everyone who follows. Cairna brings that way of working to mobility.
The way people actually move
Every journey depends on movement: the school run at 7:40, the shift that starts at six, the errand close enough to walk that still becomes a drive. Mobility plans often assume a traveler who weighs every option and chooses well every time. Real journeys run on habit, attention, weather, cost, and whatever the street makes easy.
Infrastructure determines what is possible. Behavior determines what actually happens.
Cairna works where the two meet.
Three disciplines. One practice.
Mobility planning
Fluency in how agencies plan, fund, procure and build.
Behavioral science
A deeper understanding of how people notice, choose, adapt and use what is created.
Human-centered design
The craft of designing with people, so what is built fits the lives it serves.
Together, they offer a fuller view of the same journey.
We build the practice the way a cairn is built: stone by stone, by many hands. Our team works beside licensed engineers, planners, public-works crews and the residents who know their streets best, and every project adds hands to the work. What we are building is bigger than any one of us: a practice, and a way of working, that towns can lean on for years.
The name
Cairna comes from the Gaelic càrn: a stack of stones used to mark a way across open ground. Each traveler could add a stone. The route became clearer with every journey.
The six principles
Read the ground
Begin with place and actual behavior.
Keep it useful
Make the next practical step clear.
Many hands
No one builds a cairn alone.
Make clear
Make routes, choices and decisions easier to read.
Report back
State the trade-offs. Share what changed.
Carry forward
Every stone for the one who comes after.
Two hubs. One practice.
With hubs in Atlanta and Luxembourg, Cairna serves work across the United States and Europe.
A better journey makes a better day.