A Milwaukee man is in Froedtert Hospital with serious injuries suffered in a single vehicle accident that happened just after 1 AM today.   The accident occured at N 80^th and W Congress Streets.  According to the Milwaukee Police, the SUV, a Chevy Tahoe,  was going at a high rate of speed when it left the road and struck a tree.   The Milwaukee Fire Department needed to extricate the driver from the vehicle.  There were no other passengers in the vehicle and no one else was injured.   The crash is currently under investigation, but Police believe the driver may have been involved in an earlier accident and was speeding away when he lost control and struck the tree.