I am a taxi driver and I get some customers going to bars and most of them if is not all will drink do I have to pick them up or is it Haram?

All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.

It is unlawful for you to take such people to such places as it is forbidden for the Muslim to help people commit sin. Allah Says (what means): {And cooperate in righteousness and piety, but do not cooperate in sin and aggression.} [Quran 5:2]

Be confident that Allah will compensate you for whatever you leave for His Sake with something better.

Allah knows best.