As for traffic on I 95....it's only bad in the rush hour times (7-9am, 4-6pm) just like any other city. If you are exiting I-95 1 hr before OR entering I-95 1 hr after those times then you would have had a somewhat pleasant journey compare to what it would be in those time bracket. Unless accidents of course.

Going south in rush hour, traffic normally starts around just north of the boca area. Highly suggest turnpike in rush hour.