Former NSW roads minister Duncan Gay has taken a paid advisory role with a private transport and infrastructure consultancy weeks after leaving state parliament.

Mr Gay quit politics at the end of July after being dumped from cabinet in a January reshuffle.

After 29 years in the Legislative Council he is entitled to a lifetime, taxpayer funded pension of more than $100,000 a year.

The former Nationals minister has joined the advisory board of MU Group, which bids for NSW government transport contracts.