Authorities in South Haven are investigating two motorcycle accidents that happened less than 20 minutes apart Saturday evening. In the first, the rider of a motorcycle crashed on the northbound ramp of Interstate 196 at M-140 and is hospitalized at Bronson Methodist Hospital in Kalamazoo. At 7:23 p.m., they were sent to Phoenix Road and Beechwood Lane for a crash between a car and a motorcycle where the rider of the bike was killed. No names have been released.