WASHINGTON, Dec 21 (Reuters) - The Insurance Institute for Highway Safety (IIHS) said on Tuesday the 2021-22 Tesla Model Y received its Top Safety Pick+ designation. Following a conversion to a camera-only system, IIHS said the mid-size SUV"s standard front crash-prevention system earned superior ratings in both the vehicle-to-vehicle and vehicle-to-pedestrian tests. The standard front crash-prevention system on 2021-22 Tesla Model 3 vehicles built after April also earned a superior rating in both crash avoidance tests, following a software update, IIHS said. To qualify for the awards, vehicles must earn good ratings in six crashworthiness tests, including the driver-side small overlap front, passenger-side small overlap front, moderate overlap front, original side, roof strength and head restraint tests. They must also be available with a front crash-prevention system that earns high ratings for vehicle-to-vehicle and vehicle-to-pedestrian evaluations. The vehicles must also score well for headlights. Model Y vehicles built after April 2021 meet all the criteria for the "plus" rating. IIHS is an industry-funded group that works to reduce traffic crashes, deaths and injuries through research and crash tests.