Easyway to identify Express Lane Length before next exit on 95?

I am an uber driver using the HOV tag for my old Prius to be able to use the i-95 express lanes, is there anyway to tell how long an express lane lasts for?

I am trying to figure out when to use them and when to avoid them so i don't miss an exit for a customer from not being able to get off of the express lane.

Thanks for any suggestions