Nădlac-Nagylak border crossing
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East into Romania
The border is about 50 km from Arad, and the majority of cars are going there. There is also heavy truck traffic. For hitchhiking there is a parking lot for trucks just after the border. 400 m further on there is a gas station.
West into Hungary
Szeged is about 50 km away on national road 43. There is a new bypass highway around Szeged so it is not recommended to stop there.
There are decent hitch hiking spots within 1km of either side of the border so cross on foot and continue looking for a ride from the other side.