There is no toll highway from Mobay to Negril - just nice flat highway unlike the old road filled with potholes the size of buses. There are still some stretches of the old road along the sea that branch off the new highway, if you take one of the drivers here on Negril.com in the Transportation section, ask them to take you on one of those small stretches of road. It will bring back memories....
The tollroad is on the way to and from Kingston and has a great 110kph speed limit. It makes the trip to Kingston so much more easy.