Both scar(r)ing them AND telling them to make eye contact seems better to me. People don't appreciate low-likelihood or abstract risks. I bet children appreciate them even less than grown-ups. They've never witnessed someone being hit by a car but they've witnessed thousands of people NOT being hit by a car. How do you think they would really internalize the rule to make eye contact without any evidence? Hell, even I'm more likely to make eye contact with the driver after yesterday's spike in my heart rate, and I'm not 5 years old