In general, troopers are trained to keep their heads on a near-constant swivel while they drive. And although they continue to actively look for violations, having spotters relieves some of the pressure to catch all distracted drivers.
Depending on how well the experiment goes, the van may be used more regularly.
By 7 p.m., seven troopers had pulled over 40 drivers. Some 26 drivers received warnings, seven others received tickets, according to public relations director Marissa Villansenor Cote.
One driver heading north near Parrish Lane was pulled over without a tip from the van.
"Like right there," Trooper Derek Shelby said to a Salt Lake Tribune reporter who was riding in the passenger seat. "On his cellphone."
Shelby saw the man looking at his phone, holding it chest-level. The man saw Shelby, too. He and his passenger seemed caught off guard, despite driving right next to a marked UHP car.
The man admitted to looking at his phone; he was expecting a text from a family member, he said, and was checking to see if he had gotten it.
"I explained to him that pretty much any time you have your phone in your hand, it's a hazard," Shelby said after issuing the man a ticket.
Shelby doesn't stop every seemingly distracted driver. Unless he can see the phone, he waits to decide whether they aren't paying enough attention to the road. For example, a man who glanced down multiple times while driving near Bountiful.
"Like him, he just looked down. He's looking down again. Looking down again. Looks down again," Shelby said, deciding whether to make a traffic stop. He decided against it, because "there are certain things you can do with your phone." For example, GPS. Shelby hesitates to stop people when he can't see their phones, in case their glances are just to check directions.
Not everyone who uses their phone gets pulled over; troopers want to make sure "without a doubt" people are breaking the law first, said Lt. Cory Nye, one of the spotters in the van.
Utah Code prohibits using a "handheld wireless communication," such as a cellphone, to "write, send, or read text or data" while driving. Law enforcement can't pull someone over for just talking on the phone or use GPS while driving, though it can be a secondary offense, but texting alone could land drivers a class C misdemeanor and a fine.
In 2016, troopers pulled over 369 drivers for texting while driving during operations in which officers specifically targeted distracted drivers, according to an annual UHP report. Statistics on total distracted-driving citations for 2016 were not immediately available.
"But we all know, driving down the road every day, we can see people on their phones, distracted as they're driving," said Lt. Beau Mason.
As rush hour began on Thursday, traffic picked up and drivers slowed down and more phones came out.