A man has been arrested after allegedly robbing a bank, with police catching up with him when his getaway car got stuck in traffic in Perth’s south.

Police claim the man went into a bank on Albany Highway and passed a note to a staff member about 3.35pm on Wednesday.

The man was picked up down the road on Canning Highway. Credit:File photo/Tony McDonough

He pointed at his waist to indicate he was armed and the staff member handed over an amount of cash before the man fled the bank, got into a green car and drove from the scene.

But police quickly caught up with him on Canning Highway in Como, where he was stuck in heavy traffic.