Discription of Events: Toyota RAV5, Black, 4-DR, turned left onto Payne RD from W Las Positas as the guy failed to signal. At the corner of Payne RD/Singletree, the guy didnt completely come to a stop at the STOP sign. This same guy failed to let a pedestrian cross the street almost hitting the poor high school student. His eyes popped out of his sockets as he realized this idiot driver wasnt going to make a complete stop. Scary world we live in. Thankfully, I witnessed everything from my house since I was outside trimming my garden. SLOW DOWN PEOPLE!!!