Increasing safety-belt use in Spanish drivers: a field test of personal prompts.

The team stood on a busy street in Spain. They stopped drivers at a red light. A helper leaned in and said, "Por favor, abróchate el cinturón." That is Spanish for "Please buckle up."

They used an ABAB design. First they watched drivers with no prompt. Then they added the verbal prompt. They took the prompt away, then brought it back. They counted how many drivers wore belts each phase.

The prompt raised seat-belt use by about 30 percent. When the prompt stopped, belt use dropped. When the prompt returned, belt use rose again. The change was quick and clear.

Sanders et al. (1989) tried a similar idea first. They had store greeters remind shoppers to buckle kids into cart belts. Personal contact worked then, and it still works on adult drivers now.

Clayton et al. (2006) got the same seat-belt gain, but with signs not spoken words. Signs are cheaper because you do not need staff. Yet a live voice may reach people who skip posted signs.

Gabriels et al. (2001) used public feedback boards on a college campus. Their gain was smaller, about 7 percent. A quick spoken prompt beats a passive flyer or sign.

You can copy this tactic anywhere. Stand at a parking-lot exit, lean in, and say, "Buckle up, please." It takes five seconds and no materials. Try it during school pick-up or when leaving clinic field trips. One polite sentence can save a life.