Most learning centres are able to supply a simple map - how many potential learners would be able to use it?
The majority of people have a car; car sharing often happens after a first class/workshop. Consider how you might anticipate putting people in touch about sharing transport.
Have you travelled to your learning centre by bus, or train?
How far from the centre is the bus stop or station?
Does the stop have a local name that someone could ask for? The Red Lion or Tesco Garage etc.
Would someone have to cross a busy road to get to you? Is there a zebra crossing?
Make the journey yourself and note landmarks. Familiarise yourself with the route and its potential barriers. Find out the numbers of bus services on your route, this local knowledge will encourage people to attend your community/training centre.
Would an estimated two minute walk be the same for everyone?
Is there a clear route from the accessible parking spaces to the entrance?
Try to anticipate what might facilitate someone making this journey.