Dublin Airport Terminal 2 was built on a roundabout positioned on the approach to Terminal 1, so everyone driving onto airport grounds will pass it even if they aren’t flying out of T2. However, each airport has its own dedicated approach, so congestion isn’t really an issue for drivers.
Each terminal has its own short-term car park, and the two share a long-term facility. The latter operates complimentary shuttles that connect to both T1 and T2. Driving to either terminal is no problem.
However, for those flying in, connecting between the two terminals is slightly more involved. If you’re flying in on an Aer Lingus or transatlantic flight you’ll touch down at Terminal 2. If, at this point, you need to make an onward connection to another city in Ireland or the greater EU, then you’ll need to transition between terminals. There is a transfers office located in the baggage reclaim hall in T2.
Dublin Airport Terminal 2 is close to Terminal 1, and there are no shuttle buses or light railways connecting the two. There is, however, a covered walkway that will keep you dry as you cross from one terminal to the other.
The walkway is in the spacious Arrivals Hall. You’ll see it to the left after you pass through customs. Just be advised that this glass walkway is not insulated, so you’ll want to slip on a jacket if you’re crossing between terminals in the winter.
The walkway is well-signposted and easy to find. If you happen to lose your way, flagging down a customer service assistant (CRA) is easy. Just look a pink polo shirt.