UPDATED 12 PM
The ramp has been reopened and the accident site cleared.
Several vehicles are involved in an accident at the top of the entrance to I-95 northbound at Exit 19.
State Police say that it appears to have been a chain collision, with vehicles striking each other in the rear.
Two people are being transported from the scene to a hospital by EMS.
Traffic is backed up for more than a mile already, officials report.