Never worked as a lifeguard but have 3 kids who like to swim and who have survived to be teenagers. The lifeguards at our local pools rotate about every 10 min

Never worked as a lifeguard but have 3 kids who like to swim and who have survived to be teenagers. The lifeguards at our local pools rotate about every 10 minutes. It seems like changing position and also that you have some interaction would be helpful to staying focused. It's hard to replicate that in a car but perhaps something that was asking for data - "What's the speed right now? Are there any fire hydrants in sight?" - that could be flagged if contradicted could weed out drivers who are watching a movie or nodding off.