SAN ANTONIO -

It's been a dangerous week on San Antonio roads this week, with two fatal crashes overnight bringing the total number of deaths to nine.

Two people were killed in a crash on Interstate 10 near Ralph Fair Road at 11 p.m. Thursday, when the big rig they were in rear-ended another tractor-trailer.

The load of pipes one of the 18-wheelers was carrying shifted. The impact smashed and killed the people riding in the cab of the big rig.

The westbound lanes of I-10 were shut down all night as sheriff's deputies investigated.

As deputies in the northwest part of the county worked to clear that crash, deputies in south Bexar County were working a fatal accident that killed a man in the 2300 block of Trumbo road.

"It looks like he ran off the road and he overcorrected, and in the process of him overcorrecting trying to get control of the vehicle, it rolled over," said Sgt. E. M. Conger of the Bexar County Sheriff's Office.

The pickup hit a tree and was upside down when first responders arrived, Conger said.

The two fatal crashes were among a string of traffic fatalities this week.

On Wednesday, a motorcyclist was killed on Interstate 35 near Southwest Military Highway. A witness told police the motorcycle cut over and rear-ended a truck. The impact sent the truck tumbling off the freeway onto the access road and killed the motorcycle rider.

On Monday morning, four children and their mother were killed when a suspected drunk driver slammed his car into a parked bulldozer on Medina Base Road. The driver, 35-year-old Larry Demers, is the father of the children and husband of the woman. Demers was charged in the incident and is being held in the Bexar County Jail.