Road Rules, Kauai
On Kauai the roads are narrow and at times they come down to one lane especially when crossing bridges. With this in mind here are some generally accepted "bridge rules."
Upon approaching a bridge check to see how many cars are lined up on the other side of the bridge. If there is more than 2 car lengths between you and a car ahead of you then you should stop and let the other side pass through. It is generally "known" to allow 3 to 5 cars pass through but when in doubt....defer.