PROBLEM: AUTOMATIC SPEED LIMITER MALFUNCTION WHILE TRAVELING AT 69 MPH SETTING. PAGE 87 OF OWNER'S HANDBOOK STATES" IN CERTAIN CONDITIONS, SUCH AS A STEEP DOWNHILL GRADIENT", THE VEHICLE SPEED MAY EXCEED THE SET SPEED LIMIT. THIS IS BECAUSE ENGINE BRAKING IS UNABLE TO MAINTAIN OR REDUCE THE VEHICLE SPEED. ASL ALLOWS SELECT BETWEEN CRUISE CONTROL AND ASL. ONCE SET, FURTHER ACCELERATOR PETAL PRESSURE WILL NOT INCREASE SPEED BEYOND SET SPEED. SYSTEM FAILED, AND A SURGE IN SPEED TO 90 MPH FROM SET 69 MPH HAPPEN.INCIDENT IMMEDIATELY REPORTED TO JAGUAR OF HUNTINGTON,1249 E. JERICHO TURNPIKE, HUNTINGTON, NY, 11743(631-427-2708) TECH COULD NOT DUPLICATE CUSTOMER COMPLAINT AT THAT TIME. ACCELERATOR PRESSURE HAD BEEN APPLIED DUE TO MANY HOURS OF OPERATING FROM TRIP FROM FLORIDA TO HUNTINGTON, NY(SELLING DEALER'S LOCATION). ASL MAY HAVE BECOME DISABLE AND ERRONOURSLY RESPONDED TO PETAL POSITION. HARD BRAKING APPLIED TO AVOID COLLISION WITH MERGING VEHICLES ON I 95 IN MARYLAND. *TR