A man was hit and killed by a vehicle early Tuesday on the Northwest Side, according to San Antonio police. Officers responded to the crash at around 6:15 a.m. in the 8700 block of Guilbeau Road, which is located near Tezel Road. The man attempted to cross the street in front of a vehicle heading eastbound. However, SAPD said the driver did not have time to stop before hitting the man. Officers said the man, who was believed to be experiencing h…