kus on ...? - where is ...?
   bussijaam - the bus station
   lennujaam - the airport
   rongijaam - the train station

kust ma saan takso? - where can I get a taxi?

buss - bus
lennuk - plane
rong - train
laev - ship, boat
takso - taxi
auto - car
jalgratas - bicycle

bussiga - by bus
lennukiga - by plane
rongiga - by train
laevaga - by boat
jalgsi - on foot