Uphill traffic in Hlíðarfjall is only allowed on a marked path. The path starts at the parking lot NW of the main building. The path lies on the north of the run Rennslið and towards the lodge at Strýta and then up on the north of Norðurbakki until you reach Hjalteyri, then you should cross carefully to the southbank of Norðurbakki and keep to the southside until you reach end station of the T-bar. The path is marked with red dots. Be careful crossing runs on the way up. Be smart be safe. Here are the uphill rules.