public transport 
(North American public transportation)
noun [mass noun]
Buses, trains, and other forms of transport that are available to the public, charge set fares, and run on fixed routes: a scheme to improve public transport when travelling on public transport, keep your laptop with you at all times...
- The answer for Swindon is to reduce the cost of bus fares to make public transport more attractive.
- Go by bus, train or other mass public transportation whenever possible.
- No public transportation is available that could take her all the way to work.
- the last word
- the laugh is on me (or you, him, etc.)
- the Law
- (the law of) diminishing returns
- the Law of Moses
- the law of the jungle
- the Left
- the length and breadth of
- the lesser evil (or the lesser of two evils)
- the Lido
- the lie (lay) of the land
- the life and soul of the party (the life of the party)
- the light of day
- the light of one's life
- the lights are on, but nobody's (or no one's)home
- the likes of
- the Line
- the line of least resistance
- the line (or path) of least resistance
- the lion's den
- the lion's share
- the Litany
- the little woman
- the Liturgy
- the living image of