DT*: THE CONTACT STATED WHILE DRIVING DOWN A HILL AT 60MPH IN ICY CONDITIONS, THE BRAKE PEDAL WAS DEPRESSED. HOWEVER, THE VEHICLE DID NOT SLOW DOWN AND AS A RESULT, THE VEHICLE STRUCK A GUARD RAIL WITH MINOR DAMAGE SUSTAINED. THE POLICE WERE NOTIFIED AND A WRITTEN REPORT WAS PROVIDED. THE VEHICLE WAS TOWED TO AN IMPOUND YARD TO AWAIT INSPECTION FROM THE INSURANCE COMPANY. ADDITIONALLY, WHILE ATTEMPTING TO USE THE LATCH SYSTEM, THE SEAT BELT COVERED THE LATCH BRACKET.