Vehicle was behind me as I entered I95 southbound from Cain Street. I accelerated on to a clear highway to the far left lane. The black Equinox followed me all the way cross on my tail. The vehicle then proceeded to passed me before I made it fully in the lane. Then drove on the shoulder and passed me. My left indicator light was on the entire time as I changed lanes. This vehicle had some type of local service tag with the red four sided cross sysmbol used on police, fire fighter, medical tags, MD #47460. I normally would not report something like this. But, this should not be expected from a vehicle representing public safety. Driver was first seen behind me on Dundalk Ave.