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Go to "Hell"! That's probably the most convenient place to hitchhike from out of Trondheim. Hell's a small town which you can reach with the local train (it costs about 78 kronars). Arriving in Hell you should take the mandatory Selfie with the station sign adding that you ended up in Hell and then leave the station westward (the direction you came from). There's a small tunnel leading to the other side of the rails. You continue along the small path towards west and reach some sort of parking lot after a while. There's a trampled down fence at the last lot where you can climb over to the E6 - it's a small rest area that is perfect for hitching. Otherwise you could just walk around the bushes and trees - the other side of the motorway parking space is open. Cars are about 90 km/h fast - so that's a downside. Also the airport just a few miles further might be a problem. I waited one hour what I thought was pretty long for such an ideal place. I don't think that the bridges close to the train station are a good option at all - way to central.

To go north, an extremely convenient place is a bus stop Skatval kirke 63.51290289598749, 10.859000312176718. To get there take a local train to Skatval stasjon, this is the last station to which you use a single ticket (42 NOK) valid in transportation zone A. Then walk 2km towards Skatval Church. At that point the local traffic is filtered ouт and there is enough space to stop for a car.