State transportation officials are rolling out several changes to Interstate 35 construction zones in Central Texas in response to a string of major wrecks and deaths.

Lower speeds, rumble strips and more warning signs will mark work zones along I-35 in the Waco area and parts of Hill, Bell and Falls counties.

Some new 60-mph speed limit signs are up in Hill County, but most of the new safety features will go live in the spring, Texas Department of Transportation spokeswoman Jodi Wheatley said.

Federal officials say air traffic control centers at 25 smaller Texas airports could close or see hours reduced if automatic federal spending cuts take effect next week.

Officials on Friday said travelers should expect delays when the cutbacks begin in April.

Lawyers for Lance Armstrong say the Justice Department has joined a lawsuit against the cyclist. The lawsuit alleges the former Tour de France champion concealed his use of performance-enhancing drugs for over a decade and defrauded his long-time sponsor, the U.S. Postal Service.

The suit the Justice Department is joining was filed in 2010 by former teammate Floyd Landis, who was stripped of his 2006 Tour de France title for doping.

A medical helicopter crash-landed outside an Oklahoma City nursing home early Friday, killing two people onboard and injuring a third who was pulled from the burning wreckage, officials said.

Only the flight team was onboard when the helicopter crashed while headed from Oklahoma City to Watonga, 70 miles away, to pick up a patient, said Fire Department Battalion Chief Marc Woodard. No one on the ground was seriously injured or killed.