Tram lines (group of companies) and Bus company make surveys in main city stations to the people waiting for the tram or bus, sometimes on the street to know about pedestrian and even there exists some road zones where they give paper with questionaries to the drivers and ask for feedback. (Personal interview, Google Form Web system, competitions or ideas contests) Now change to online system of course.
As well as there exists in every important crossroads special beacons to have an accurate feedback of the number of cars using the road usually underground near surface to register every use of the road. Sometimes when they are going to make a change in traffic they use surface cable system sensor.
Now a review of the situation here:
Our orography and economy is a handicap but we have a reasonable coverage in main populated zones. Talking about the capital city (Santa Cruz de Tenerife) after Tram line 1 develop ALL urban lines suffered a revolution but with a month fare pass you are able to go near everywhere.
Generaly mornings and afternoon, special hours of much traffic are very well covered but the night is not very well done. We are in a quiet zone the tourism zones with disco-pub and night activity are in the coast and usually people use the car. The public integrated system only makes an effort in special massive days activities like: Carnaval, Sleepless Night Musseum and this kind of events, and special days where exists massive use usually the bus system because of the day of party in every city local festival. Its like a circle... no bus or tram at night... you must use own car... and again.
Just in the city times are short enough for you to organize your life.
Specialy if you use Tram, very accurate. The Bus depends on the traffic and number of cars make difficult some routes but its good i think.
Some lines are NOT very realiable. We have so much lines and last years less drivers (economy) some times there exists difficulties. The panel system that announce times to arrive is not very good but we begin to have ONLY in the city (gps and beacon systems... poor) a new system (just begining now)
Yes, this feature is well enough IF YOU UNDERSTAND THE TRANSPORT SYSTEM.
Somebody wants to go bus like years ago and don't understand the combinated transport system.
Main lines (Tram and massive bus lines) have very good and modern units.
Reduced mobility have a cover and people is supportive with babycars blind and tourist with big bags (but bus not ready for it in city lines)