[1] The Swedish side is extremely popular with Norwegians who flock to buy relatively cheap goods in Sweden, where a large shopping area can be found immediately after crossing the sound.
Norwegian and Swedish customs authorities have offices and checkpoints on their respective sides of the sound.
While there is not normally any passport control on the border, vehicles crossing are regularly stopped and searched.
Norway is not in the EU so there are much stricter restrictions on the amount of goods (e.g. alcohol, cigarettes, food, etc.)
Customs duties are paid immediately after crossing the border using the new bridge.