La Plata

La Plata is the capital of Buenos Aires province in Argentina.

North towards Buenos Aires
There's a roundabout followed by a series of speed bumps at the beginning of the highway leaving La Plata. You can take a number of buses (for sure the 307 A and E, but others, too) to the roundabout. At the first speed bump, you have good visibility as cars enter from the roundabout, and there's space for them to pull over just past the speed bump.

If you can't get a ride and want to take a bus, buses pass rather frequently, and you can catch one on the opposite side of the roundabout. With a Sube pass, it costs 25 pesos (as of April 2014).

Alternatively, the train to Buenos Aires costs less than a local bus within La Plata (2.80 pesos vs 3 pesos as of April 2014).

Other useful info
If you buy a Sube pass to ride the buses in La Plata, it's the same pass for the buses and subte in Buenos Aires.

La Plata (Buenos Aires)