San Salvador de Jujuy
San Salvador de Jujuy (or just Jujuy) is a city in Argentina.
South/South-east towards Salta/San Miguel de Tucuman/Resistencia/Santiago del Estero
Take road #66 to Salta, don't use #9 - it's old, difficult and no traffic.
One of the options (honestly not really good): Try to get to Palpalá (there should be a bus from New Terminal in Jujuy), then walk about 2km from Palpalá terminal along the highway to the end of the city. Not really a good spot because of high speed, but we got a ride after 3 hours directly to Salta (December 2017). To other cities take a ride to the big intersection with road to Salta after General Guemes.
Other option: Take a bus to a big supermarket called Changomas. Everybody knows it, and you will easily find an urban bus there. Then, walk under the bridge and you find a roundabout which is not bad, heading both 66 and 9. If you walk along the road direction south you will also find a gas station with better possibilities.
North/North-west towards Purmamarca/Tilcara/Humahuaca/Bolivia
Take bus 35, 36 or 39 to Yala (20 pesos, you will need a Sube card or ask to use someone's). The stop is on avenida 19 de Abril, no need to go to the new bus station! After town, you should find a row of trees for the shade. There is space all along the road up until Humahuaca at least, in both directions. Cars don't go too fast, it's an easy hitch.