Car
Cars driving into or out of central Stockholm between 6:30AM and 6:29PM are charged a congestion tax (http://www.transportstyre...) of 10 to 20 SEK. Some car rental companies charge their customers separately for the cost of toll passages, while others don't. Foreign-registered cars are exempt from the tax. Driving in Stockholm is easy compared to many larger capitals in the world. Just make sure to use your indicators when changing lanes. Fees are not charged at all in July, on holidays such as Sundays or on the day before a holiday such as Saturdays.
Parking is restricted and expensive in the centre of the city and free parking is not often available even in the suburbs except at external shopping centres. It is recommended for peace of mind to make use of SL services to avoid parking and congestion charges.
Bike
Cycling is an attractive option and there are many bikepaths. On a bike, a journey across central Stockholm' will take no longer than 30 minutes and can be faster than travelling by subway or car. There are cycle paths along most major streets and drivers are generally considerate towards cyclists. In winter, when paths can be covered by ice, extra care should be taken. Bikepaths have a bicycle painted on the ground and/or round blue signs with a white bike. Make sure you bike on the right hand side of the street, just as the cars.