All student cars may be prohibited if the present ban on overnight parking is unsuccessful, according to Matthew J. Toohy, Captain of the University Police. More than 75 cars were ticketed early yesterday morning in an all-out effort to eliminate student overnight parking in a wide area of Cambridge.

Arthur D. Trottenberg '48, Manager of Operating Services, commented that officials were prepared to extend the area proscribed by the new University parking rule "from Porter Square to Fresh Pond Parkway," in an attempt to "clear up the parking mess."

A survey by the CRIMSON yesterday morning revealed that almost all students with cars had complied with the new ruling. Of more than 420 cars parked in the restricted area after 2 a.m., only 108 displayed a Harvard registration sticker, and more than half of these were parked on the fringes of the area.

More than 60 non-Harvard cars, however, were parked in violation of the trial alternate side parking laws passed by the Cambridge City Council last month. Remington St. was almost impassable, but none of the cars lining both sides of the street and University registration stickers.

Police officials are not tagging cars with commuter stickers. These cars, as well as all of the cars with no stickers, are being checked against state registration lists in an attempt to find students who have avoided registration of their cars with the University, a violation which carries a $25 fine.