Thirteen officers spent Tuesday morning parked along some of the city’s busiest 35 mph corridors, and by lunchtime they had pulled over 91 drivers.

The Fishers Police Department said 12 of its officers, joined by a deputy from the Hamilton County Sheriff’s Office, ran a targeted speed enforcement detail from 9 a.m. to noon. The worst offender clocked in at 25 mph over the posted limit — roughly 60 mph on a road designed for 35.

The timing was not accidental. With Hamilton County students heading back to classrooms, police say the mix of school buses, walkers, bicyclists and crossing guards changes the math on residential and collector streets that drivers may have gotten comfortable speeding through over the summer.

“As kids head back to school, we’re asking everyone to slow down, stay alert, and help protect the people who share our roads,” the department said in a post announcing the results.

Speed is one of the sharpest variables in whether a crash is survivable for someone outside a vehicle. Traffic safety researchers have long found that a pedestrian’s risk of serious injury or death climbs steeply as impact speed rises above roughly 20 to 30 mph — which is why enforcement efforts like Tuesday’s tend to concentrate on posted-35 roads rather than highways.

Ninety-one stops in three hours works out to roughly one every two minutes across the detail. The department did not say how many of the stops ended in citations versus warnings, or which roads were targeted.

Not every contact Tuesday morning involved a violation. Police said one officer broke off from enforcement to help an expecting family install a child’s car seat — a service Fishers officers and other Hamilton County agencies regularly provide, and one that safety advocates say matters given how often seats are installed incorrectly.

The department framed the morning as two halves of the same job. “But today wasn’t just about enforcement,” the post read, before closing with the department’s tagline: “Safe Streets. Strong Community.”

Multi-agency traffic details have become a routine tool for Hamilton County departments, which often coordinate around back-to-school weeks, holiday travel periods and known problem corridors. Partnering with the Sheriff’s Office lets a city department put more units on the road at once than its own patrol schedule would allow.

For drivers, the practical takeaway is simple enough: the 35 mph signs on Fishers’ arterials are being watched, and the margin officers were willing to extend Tuesday morning was thin.

Residents who want a car seat checked or installed can contact the Fishers Police Department to arrange an appointment.