Big impacts not requiring sophisticated technology

Decision-Making

Did the simple act of painting lines on roads save hundreds of thousands of lives? In their book Reducing Global Road Traffic Tragedies, Gerald Balcar and Bo Elfving argue that it did. The first American centre line appeared near Detroit in 1911; the man responsible for it claimed a leaky milk van leaving a white streak inspired him. Over the next few decades, road engineers began to favour yellow centre lines, which were made reflective by adding glass beads to paint. But edge lines remained rare outside cities.

What changed that were studies from the 1950s showing that painted edge lines cut road accidents, especially fatal ones. In the early 1970s Potters Industries (which made the glass beads, and employed Mr Balcar) calculated that driving on a rural road at night was six times deadlier than driving on an urban road during the day. Cars were running off the roads largely because drivers could not see their edges. As edge lines and marked intersections proliferated, and Americans began wearing seat-belts, the road-death rate began to fall.

Rain. A rural bend. Headlights catch the painted edge before the driver reaches it. The information appears at the moment of correction, using technology available for more than a century.

Simple interventions are routinely undervalued because they leave little for experts to display. A painted line looks like maintenance. A complicated detection system looks like innovation. Budget discussions can therefore reward technical novelty while ignoring reach, reliability and the number of human decisions the change improves.

The line works because it fits the task: immediate visual guidance, repeated continuously, usable by every driver already on the road. Road markings remain one part of the system. Speed, vehicle safety, lighting, road design and enforcement also affect deaths. Paint fades. Snow covers it. Standards and upkeep determine whether the simple mechanism remains available.

The commercial lesson is to compare total effect, not sophistication. How many people encounter the intervention? Does it require adoption, charging, login or explanation? What happens under poor conditions? Who maintains it? A basic change used millions of times can outperform advanced technology used perfectly by a few.

Retrospect makes centre and edge lines look obvious. They were still designed, tested, standardised and repainted. Before the next wet night, a maintenance crew checks reflectivity and repaints a faded bend. The driver sees the curve because somebody completed the ordinary work again.