There are 15 bus routes covering both the centre and outlying areas, operated by the CTT company. Tickets cost €1.50 per journey and are valid for 75 minutes from the moment they are validated (on board the bus when you start your journey).
Tickets are available from tobacconists. There is a small machine on the bus where you should stamp your ticket when you get on. If your journey involves taking more than one bus, or the bus plus funicular railway (Montenero), you only need to stamp one ticket at the beginning of your journey (as long as you are within the 75 minute limit).