The Safety Shape is the secret behind the success of the concrete barrier- a configuration designed to lift impacting vehicle wheels, reduce the overturning moment and return the vehicle to the roadway surface. That it works is attested to daily by the many tire marks left on barrier sides across the country, without accompanying reports of injuries or accidents. More and more concrete barriers are supplanting other types of safety barrier. It has now become necessary to find expedient ways of converting these old barrier systems to the new Safety Shape design. A proposed design from Pennsylvania uses stay-in-place forms of precast concrete. These are filled on the site with fresh concrete placed around old vertical barrier posts. Posts are left in place to furnish anchorage and lateral support. The method eliminate costly post removal and saves construction time and money. Precast shells, or forms, can be made with white cement for greater visibility or fiber-reinforced concrete for greater impact resistance. One median design in common use that presents a safety problem has prompted many question and many requests for a practical design to modify it. This is the low, narrow curb median divider in the center of a four-lane roadway. Usually these are six to eight inches high and perhaps four feet wide. Here again the new Safety Shape could be added to avoid expensive removal of concrete. With electronic controls now available on slipform barrier machines that permit placing the barrier to different base elevations on the two sides, these divided sections could be individually slipformed. Precast barriers could also be used, perhaps with precast divider panels dropped in normal to the barrier at appropriate intervals to provide proper spacing and additional support. In either case, the old divider left in place at the inside base of the barrier would furnish lateral support against vehicles impacting the face of the barrier.