TERRE HAUTE, Ind. (AP) — Indiana State Police are working to make construction zones on Interstate 70 safer after three people were killed last week in two separate crashes in western Indiana.

Seven people have died so far this year in a 20-mile stretch near Terre Haute and Brazil, The Tribune-Star (http://bit.ly/2tJGH5Q ) reported.

The most recent fatal crash involved a truck driver who wasn't able to brake in an area where traffic had slowed due to another collision. The Clay County Sheriff's Department is investigating the crash.

Drivers will see an increased trooper presence on the highway's work zones in the coming weeks, said Sgt. Joe Watts, a spokesman for Putnamville District Police. Troopers will focus on speeding as well as dangerous and aggressive driving, he said.

"We're doing our very best — as we've always told the public we're going to — to prevent another tragedy," Watts said.

Although all of the fatal crashes have involved semi-trucks, Watts said troopers will be watching for violations from vehicles of all sizes.

"(Trucks) are not being targeted, but they are the biggest vehicles on the road; they weigh more and can cause much more devastation," he said.

Officers are issuing tickets with a $300 minimum fine. They're also posting photos of traffic stops on Twitter to discourage speeding.

Terre Haute Police Chief John Plasse said the department will use leftover grant money to help patrol a 15-mile stretch of the interstate in Clay County from Aug. 1 to Aug. 10.

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Information from: Tribune-Star, http://www.tribstar.com