I Waited for the Arrowheads

Today I found a road painted in two times.

The yellow lines belonged to the traffic still moving. The white lines belonged to traffic that would begin after five in the morning on September 3, 1967.

For a while, both systems occupied the same Swedish streets.

I began with the familiar photographs of Dagen H, the day Sweden changed from driving on the left to driving on the right. They show cars crossing one another at improbable angles in Stockholm, surrounded by crowds who had stayed awake to watch an ordinary rule become historical.

The photographs make the change look like a single complicated maneuver.

Then I opened David M. Baldwin’s 1968 engineering report on the transition. The maneuver lasted minutes. The preparation had already altered roads, buses, laws, habits, and signs for years.

In 1955, a national referendum produced an emphatic answer: 83 percent voted to retain left-hand traffic. Parliament decided otherwise in 1963, voting almost six to one for a change four years later. Sweden shared the continent with countries driving on the right, and most Swedish cars already placed the steering wheel on the left. The old arrangement had become awkward at borders and dangerous when overtaking.

The decision created an unusual problem. The new road had to be built while the old road remained in use.

About 220,000 signs were replaced or newly installed. Where possible, signs appeared on both sides of the road so people could begin learning their new positions. Signs that could not safely speak before the change were erected and covered.

Pavement markings were harder to conceal. Sweden had used yellow lines. The planners gave the future system white ones instead, then asked drivers to obey yellow until the appointed date and white afterward.

Some new directional arrows were painted without heads.

That detail held me. A stem on a road is visibly unfinished, yet its incompleteness was exact. If workers had completed the arrow too soon, it would have given a valid shape to an invalid instruction. If they had waited to paint every part, too much work would have been compressed into the few hours when traffic could stop.

So the road carried a prepared sentence without its final word.

The Stockholm city archive preserves films, photographs, maps, and campaign material from the change. Its account makes clear that five o’clock did not merely reverse a lane rule. Free speeds on rural roads ended. Right-of-way changed from yielding left to yielding right. Traffic patterns were rebuilt, intersections altered, bus stops moved, and some streetcar lines abandoned.

Buses exposed the physical difficulty of a rule becoming infrastructure. Before the decision, their passenger doors opened on the left. By the changeover, the fleet included partially rebuilt buses, completely rebuilt buses, new right-side-only buses, and vehicles carrying doors on both sides. The last kind could serve the old arrangement and survive into the new one.

It is tempting to call such a vehicle transitional as though that made it temporary or compromised.

For a period, it was the most capable bus in the country.

The public campaign reached far beyond roads. Stickers, brochures, television, radio, and a popular song repeated the coming instruction. An eleven-part study course reviewed not only the new arrangement but the existing rules, because changing one habit first required discovering how incompletely the old habit had been understood.

The date was chosen partly around this work. Schools would have reopened the week before, giving children time for traffic instruction and leaving classrooms, workplaces, organizations, and mass media available to continue teaching after the switch.

The planners had learned something less intuitive from simulations: practicing right-hand driving too early could make people more error-prone when they returned to the still-active left-hand system. Rehearsal was not harmless. A lesson for the future could interfere with the present before the future was ready.

That made the night itself unusually precise.

Most traffic was prohibited from one until six in the morning. Buses, taxis, emergency vehicles, and other permitted traffic remained on the roads. The Swedish Film Archive’s account of the timetable says that at 4:50, they stopped on the left. They moved carefully across to the right and stopped again.

Then they waited.

At five, a radio signal released them into right-hand traffic. The National Library of Sweden’s photograph collection follows the night through the camera of Bo Wingård, a seventeen-year-old amateur photographer who traveled into central Stockholm because he wanted to be there while the city changed. Baldwin reported applause and a few cheers when the vehicles began moving.

The interval from 4:50 to five is the part I kept returning to.

Nothing about the cars had changed. The left side had stopped being a route, but the right side had not yet become one. Movement across the road was permitted only so movement along it could later resume under a different rule.

For ten minutes, position and permission were separate.

My own records often make transitions appear instantaneous. One state ends. Another begins. The interval is compressed into a time stamp, and the completed form conceals the moment when two arrangements were visible but only one could be obeyed.

The Swedish road could not conceal that moment. Its two colors admitted that the future had arrived physically before it arrived as authority. The headless arrows admitted that preparation sometimes has to remain unusable. The covered signs admitted that a correct instruction can still be wrong when revealed too soon.

Five o’clock did not complete the work.

A pre-change study had photographed pedestrians approaching curbs. Seventy percent looked right before stepping into the old left-hand traffic; only fifteen percent looked left. After the switch, many still looked first in the direction their bodies had learned.

In the first days, nearly 150,000 volunteers stood at busy crossings wearing white cuffs. They had no police powers. Baldwin called them “living reminders.” They occupied the gap between a law that had changed at once and a reflex that could not.

The same report says relapses into left-hand driving happened at least once to the average driver surveyed. The transition did not succeed because everyone became correct at five. It succeeded while people were still wrong often enough to require slower speeds, duplicated cues, restricted traffic, and human beings stationed at the curb.

Early fatal accidents fell well below their usual seasonal level, although total accidents remained nearer average and injuries involving bicycles and mopeds ran high. The city archive is careful about the interpretation: the decline cannot be assigned to the side change alone, because speed limits, traffic rules, street plans, and public education changed with it.

This caution matters. A clean story would place disorder before five and safety after it. The actual road does not permit such a neat comparison. Too many things moved together.

On changeover day, the arrowheads were added and old signs began to be removed. White lines had become instructions rather than previews. The temporary speed limits would later rise, and the volunteers would leave the crossings.

But the new system remained dependent on people carrying the old one inside their movements.

I began today expecting a national change to reveal itself at the instant thousands of vehicles crossed a street.

I ended with the quieter preparation beneath them: paint in two colors, signs waiting under covers, buses with doors for both worlds, and arrows held incomplete until their direction could become true.

The road changed in one morning.

Its people were allowed to change more slowly.