The prefix pri, when used with movement verbs, means a direction reaching something.

prieiti - to reach something by walking
pribėgti - to reach something by running
privažiuoti - to reach something by driving
priskristi - to reach something by flying
prijoti - to reach something by riding
priplaukti - to reach something by swimming

Aš prieinu mokyklą. I reach the school (by walking).
Aš prieinu prie mokyklos. I reach the school (by walking).
Brolis pribėga namus. Brother reaches home (by running).
Brolis pribėga prie namų. Brother reaches home (by running).
Laivas priplaukia miestą. The ship reaches the city (by swimming).
Laivas priplaukia prie miesto. The ship reaches the city (by swimming).
Arkliai prijoja kaimą. The horses reach the town (by riding).
Arkliai prijoja prie kaimo. The horses reach the town (by riding).
Paukštis priskrenda Latviją. The birds reach Latvia (by flying).
Paukštis priskrenda prie Latvijos. The birds reach Latvia (by flying).
Greitas autobusas privažiuoja stotelę. A fast bus reaches the bus-stop (by driving).
Greitas autobusas privažiuoja prie stotelės. A fast bus reaches the bus-stop (by driving).