Changes

The Catch bus 1 ( or bus 34 if that is more conveniant) from Reykjavik to Hafnarfjörður (280 ISK) which stops for 5 minutes at the main bus station in Hafnarfjörður and then proceeds further into Hafnarfjörður (Bus 1 "Hfj. Vellir"). When the bus leaves the main station in Hafnarfjörður you can ask the driver to stop Get off at the bus stop closest to ReykjanesbrautSuðurhvammur, from there it looks like a regular highway onramp, but actually it is not a highway, or so while you can keep your eye hitch directly then and there on a map. From there you can walk to the Reykjanesbraut onramp it is generlly quicker and it's fairly doable easier to hitch from the side of just walk onto the main road and walk along that roadfor a 100 meters or 200 meters until you find a place where cars can pull over.