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Changes
→North, nortwest towards La Serena (Ruta 5)
Go to "Puente Cal Y Canto" metro station (2nd line) and find Avenida La Paz, follow this street to La Paz Terminal and from there take a bus with the sign "Panamericana" (800 pesos, if youre lucky - for free). Take a seat in front and search for a spot you like or ask the driver for "lugar para hacer dedo", perhaps he knows. There is for example one on-ramp near big truck station, cars are going about 60 - 70 km/h so its possible to hitchhike
Alternative: Use google maps to take public buses until one access ramp that could be suitable (spoiler: none of them really are great). One could be here (-33.321808, -70.719898). From there your main objective is to find someone that can help you reach the Copec gas station further ahead (-33.2156679, -70.7675877). Then from this Copec it's really easy to hitch a ride.
===North, northeast towards [[Los Andes]], [[San Felipe]] and [[Mendoza]] [[Argentina|(AR)]] (Ruta 57)===