Cops issued Miami Heat forward Haywood Highsmith a citation for careless driving on Tuesday ... after they say he caused an accident that resulted in a man suffering a partial amputation of his leg as well as other broken bones.
According to a crash report, obtained by TMZ Sports, the gruesome wreck happened at around 11:20 PM -- just minutes after Highsmith and the Heat beat the Orlando Magic at the Kesaya Center in Miami.
Cops state in the documents that Highsmith was going an estimated 45 MPH in a 40 MPH zone .