Single-Lane Bridge Priority: who's the "noble one"?

Single-lane bridges in Iceland operate on a courtesy rule, not on signs. The car closer to the entrance has right of way. You signal you've yielded by flashing your headlights once. Two flashes from the other driver = thank you. This is genuinely different from US "first to the stop line" rules, and different from most European "priority from the right" rules.

If both drivers arrive at the same time, the larger vehicle typically yields to the smaller (so a bus goes first, you wait). If you're unsure, flash your headlights once to invite the other driver to go — they'll flash back once to thank you. This is the universal "knock on the dashboard" equivalent.

The exception: tunnel priority. Single-lane tunnels in Iceland (around Vestmannaeyjar, for example) have a traffic light system. Always obey the light. Do not try to wave another car through a tunnel.

Each scenario is a real situation you'd meet on a Ring Road drive. Click the option you think is right. The explanation reveals both the rule and the common-sense interpretation. After the 10 questions you'll have a clearer mental model than most tourists leaving Keflavík.

If you score 8+ you're already safer than the average rental-car driver in Iceland. If you score under 5, re-read the rules above and try again.

The scenarios are simplified. Real bridges sometimes have a small shoulder that allows two small cars to pass — that's an ad-hoc courtesy, not a rule. If the bridge is signed (a small white sign with a red triangle), obey the sign regardless of who is closer. Some bridges in heavy tourist areas (e.g. near Goðafoss) have informal traffic patterns that locals know and tourists don't — just be patient and follow the local's lead.

This tool doesn't cover what happens when two buses approach a narrow bridge at the same time on a foggy day — at that point, just stop, turn off your engine, and wait for the bus driver to figure out which one backs up.