There's a car park at the base of the climbing part of the mountain. You can't drive any further than that. I haven't been there for over a year and the car park was actually closed then, but there's room to park on the road anyway.
Directions: Take the Roundwood exit from the N11, following the signs for Avoca Handweavers. The road winds upwards quite steeply for about a mile and a half. When you get to the top of the hill, keep a look out for a disused council yard on the left hand side. There is a decaying cattle trailer in the yard. Take the left turn at the end of this yard and continue on. You will see the Sugar Loaf on your left