1963 the Riksdag passed legislation ordering the switch to right-hand traffic. The changeover took place on a Sunday morning at 5am on September 3, 1967, which was known in Swedish as Dagen H (H-Day), the 'H' standing for Högertrafik or right-hand traffic. Since Swedish cars were left-hand drive, experts had suggested that changing to driving on the right would reduce accidents, because drivers would have a better view of the road ahead. Indeed, fatal car-to-car and car-to-pedestrian accidents did drop sharply as a result. This was likely due to drivers initially being more careful and because of the initially very low speed limits, since accident rates soon returned to nearly the same as earlier. Total roadways: 572,900 km, as of 2009. Motorways Motorways run through Sweden, Denmark and over the Öresund Bridge to Stockholm, Gothenburg, Uppsala and Uddevalla. The system of motorways is still being extended. The longest continuous motorways are Värnamo-Gävle (E4; 585 km) and Norwegian border - Vellinge (E6; 482 km; as the motorway between Trelleborg and Oslo in Norway has been completed in 2015). Ports and harbours Gothenburg Gävle Halmstad Helsingborg Hudiksvall Kalmar Kapellskär Karlshamn Karlskrona Lidköping Malmö Norrköping Nynäshamn Stockholm Sundsvall Sölvesborg Trelleborg Varberg Västerås Waterways: 2,052 km (2010) note: navigable for small steamers and barges Merchant marine total: 135 ships ( or over) totaling / ships by type: (2010) bulk carrier 4 cargo ship 26 carrier 1 chemical tanker 15 passenger 5 passenger/cargo 36 petroleum tanker 11 roll-on/roll-off 30 vehicle carrier 17 Airports 230 (2012) Airports with paved runways (Official figures. A great number of wartime airfields exist with various lengths, usually built into roads, and are usually less than 1000 m long) total: 149 over 3,047 m: 3 (Arlanda, Landvetter, Luleå) 2,438 to 3,047 m: 12 1,524 to 2,437 m: 74 914 to 1,523 m: 23 under 914 m: 37 (2012) Airports with unpaved runways total: 81 914 to 1,523 m: 5 under 914 m: 76 (2012) Heliports 2 (2012) (Every hospital, airport and military base has Helipads.) List of airports Gothenburg City Airport Göteborg Landvetter Airport Jönköping Airport Luleå Airport Malmö Airport Stockholm-Arlanda Airport Stockholm-Bromma Airport Stockholm-Skavsta Airport Umeå Airport Växjö Airport – Smaland Airport Pipelines See also Sweden Government agencies in Sweden Scandinavian Airlines Volvo, Saab Automobile, Saab, Scania Estonia disaster Transport in Denmark Transport in Finland Transport in Iceland Transport in Norway References CIA World Factbook 2010 External links resrobot.se, Search