In some cities, road lanes have a diamond painted on the pavement. What is that for?
The diamond symbol on the pavement indicates that lane is reserved for a certain class of vehicles. It could be a high occupancy vehicles (HOV) lane specifying a minimum number people that must be in a vehicle or reserved for transit buses. Signs at the beginning of these reserved lanes will indicate the criteria for using the lane and any other relevant information—such as time of day the restriction is in place.
