Parassapuszta-Šahy border crossing
The Parassapuszta-Šahy border crossing joins Hungary (near Parassapuszta) with Slovakia (at Šahy). It lies on European Route 77. In Slovakia this route is national road 66, while in Hungary it is national route 2 and later the M2 motorway.
Because Slovakia and Hungary are part of the Schengen zone, there are no border controls and cars drive by quickly. However, a lot of trucks drive through this crossing, and it is easy for them to stop here.
If you are going to Poland, this is the ideal place for you. Don't bother hitching short-distance rides. Just hold a sign "PL", and it won't take you long to stop a truck.