<map lat='39.909209536859834' lng='32.81890869140625' zoom='10' view='0' float='right'/>
Ankara is the capital of Turkey, surrounded by a big ring road.
Get dropped off at any exit on the ring road and you should be able to hitch to either a metro/bus stop or if you are lucky all the way to downtown.
West towards Istanbul
In Kizilay (city center), there is the main dolmus and city-bus station...there you ask around for a bus to Yaskament, but the buses going there leave about 500meters away from that dolmus station, so you just ask around a little bit (it´s across the street, when you cross the main park int he city center). The bus goes about 30minutes and brings you to the start of the highway to Istanbul.
Northeast towards Samsun
Here you should actually just take a dolmuş going in direction of Kırıkkale; from there you can easily hitch-hike up north to Samsun. You can find such minibuses in Ulus in city centre, next to the Julian column. These minibuses will have a sign saying "Mamak", the name of the easternmost suburb of the city, on their windshields. They will take you as far as to the ring road surrounding the city.
Along the highway between Ankara and Kırıkkale, there is a gas station at every half kilometres (nope, not kidding). Waving with your hand and thumbing around these stations work fairly well, and trucks stop easier. If all else fails, you can ask people at the gas station.
Actually you just go by metro, or dolmus to the main bus station called A.S.T.I, then you can actually already see the highway, if you turn right you can see the signs saying "Konya" and Kolbasi... you just walk along the highway...which is only about 2kms, from there you can hitch easily out of the ring of ankara which has the junction in Golbasi, or you just take a Dolmus to Golbasi for 2TLR, the dolmus stop is a crossover of the highway, where the dolmuses (?) stop....