LINCOLN, Neb. (AP) — The Lincoln firefighters union has challenged the fire chief’s order to use a pickup instead of a firetruck to respond to some medical calls.

The union filed a grievance two weeks ago after Chief John Huff sent a directive about the truck on May 12. He told captains at Station No. 1 to use what’s called the alternate response vehicle or report why they didn’t.

City Public Safety Director Tom Casady says the pickup isn’t being used as often as it should be used.

City officials say the pickup is a more cost-effective way to get paramedics to patients more quickly. But union leaders say the savings are minimal and come at the expense of safety.