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Drivers slid across the lanes and crashed into guardrails and other vehicles on almost every freeway. Houston police said more than 750 accidents were reported between 10 p.m. Thursday and 11 am. Friday.

Most freeways had sections closed before dawn because of icy conditions. Overpasses and bridges remained treacherous well after daylight.

TxDOT said 140 people, 65 sanding trucks, 70 herbicide/shadow vehicles and 15,000 gallons of liquid magnesium chloride were used to monitor and combat the icing conditions.

“I’m confident that our efforts in treating the roadways with the magnesium chloride helped to minimize the severity of this event.  Without our pre-treatment activities, the event could have been much worse,” said Houston district engineer Delvin Dennis, with TxDOT.

METRO Services, Lynchburg Ferry

METRO Park and Ride service was canceled Friday. All high-occupancy vehicle lanes have been closed. METRORail service was modified to 10-minute intervals between trains instead of the normal 6-minute intervals. Bus service was expected to operate on its regular schedule, but some detours because of ice may be necessary.

The wintry conditions also make travel by water troublesome. The Lynchburg Ferry closed at 2 p.m. Thursday. It will not reopen until 10 a.m. Saturday.

Many drivers did not see the ice until they were sliding on it.

“It is horrendous. People really have to be careful while they’re driving. If they don’t have to go somewhere, stay at home,” motorist Raymond Keith said.

Emergency crews had trouble getting to some of the wrecks because the roadways were so slick. Houston firefighters asked people to stay off the roads because they could not get to many areas.

“The ice that’s there now really is not going to move, it’s not going to melt away, until a little after the lunchtime hour. And it’s not going to melt away completely because temperatures in the afternoon won’t climb enough,” KPRC Local 2 meteorologist Anthony Yanez said.

Yanez said the ice won’t melt completely until late Saturday morning.

“By 9 p.m., we’re going to head back below freezing again,” Yanez said. “Tomorrow morning, we’ll see that ice again.”

“This is the worst of all possibilities,” Harris County Judge Ed Emmett said. “People look out and say nothing happened, and they don’t realize this is the black ice. This is the sheet of ice we were most worried about.”

All Harris County toll roads were shut down Friday morning, including the Sam Houston Tollway, the Westpark Tollway and the Hardy Toll Road.

“We have the entire system, basically, shut down,” said Peter Key, director of the Harris County Toll Road Authority. “It will remain that way until the latter part of the afternoon. I think there’s a good chance that a majority of the elevated interchanges will remain shut down until tomorrow. If we’re going to have another freeze tonight, and we can’t get rid of the ice, we’re just going to keep those closed until we get some warmer weather tomorrow.”

Some drivers were stuck in traffic for hours because of all the wrecks.

Many drivers ran into trouble on the roadways and took extreme measures to try to get out of it.

“We’re seeing people driving in the wrong direction on the highways or on one-way streets,” Harris County Sheriff Adrian Garcia said. “We really need to urge the community to stay home. As Judge Emmett would say, hunker down. We need people to stay home or stay put. Don’t get on the roadways. You’re really going to put yourselves in harm’s way; you’re really going to put our brave Harris County sheriff’s deputies in harm’s way.”

Garcia said that drivers could get tickets for going the wrong way.

“They likely could,” Garcia said. “But our deputies are also using good judgment and recognizing that people are finding themselves not respecting the road conditions and weather conditions and they’re having to make those dangerous maneuvers.”

Many bridges on side streets were also covered with ice and should be avoided.

Houston police said there was an inch and a half of ice on the ramp from the South Loop to state Highway 288 North.

Houston Mayor Annise Parker stressed the importance of staying off the roads.

“We’ve responded to hundreds of accidents,” she said. “Most of the accidents have been very minor.”

She said drivers should pay attention to law enforcement’s instructions to keep everyone safe.

“Do not move the traffic cones,” she said. “We’ve had a significant problem with that this morning. People want to go around those cones and then they get into trouble.”

Parker said drivers who find ice patches should call 311 to report it.

The top priority in Galveston was keeping the causeway open. TxDOT treated the bridge with magnesium chloride to keep it ice-free in temperatures below 20 degrees. By 8 a.m. Friday, traffic was reduced to one lane each way because of icy conditions

Why Did Roads Get Icy?

The Texas Department of Transportation and Harris County Toll Road Authority treated bridges and overpasses with magnesium chloride before the freezing rain arrived, but it was not enough.

“The Toll Road Authority did everything they could, but this is the kind of incident you just cannot control,” Emmett said.

Emmett said the precautions taken worked as well as they could.

“The worst scenario is always to have freezing rain,” he said. “Not sleet, not snow, but rain that falls and freezes once it hits the ground. When that happened, roughly around midnight, then the trucks couldn’t even go put down other chemicals. The HCTRA trucks, the TxDOT trucks, they couldn’t get up to put any more chemical down. That’s why the whole system shut down.”

Emmett said that if the ice melts enough, trucks will be sent out to treat the roads before it freezes again late Friday and early Saturday.

“Even though it melts, and even though it gets treated, if it re-freezes, we’re going to be in the same circumstance,” Emmett said.

TxDOT said crews have been working around the clock to monitor the roadways. Officials said they expected snow, but what Mother Nature delivered was much worse.

A TxDOT sand truck lost control on an icy road in Katy and flipped on its side.

“It’s a little more challenging for us, actually a great deal more challenging for us than the anticipated snowfall that was initially forecasted,” said Raquelle Lewis with TxDOT.