I am travelling to USA tomoorow and using portions toll. How can I make the payment? Do I need coins?

Payment of the road toll may be made in cash, by credit card, by pre-paid card or by an electronic toll collection system. I really don't know how much tolls are, but yes, brings some coins along.

Enjoy your stay here!☺

You can use cash, there are cash lanes, coin only lanes and most states and regions have pre-paided only lanes. DONT use teh pre-paid only lanes since I imagine you dont have a pre-paided toll since your asking this question. If you use a pre-paided tool lane you will get a $100 fine.
Try not to use any bills larger than a 5, coins are the easiest way.