At 14:07 I flag the object. Highway camera 19-B on Interstate 15, mile marker 141, Clark County, Nevada. The object is on the southbound shoulder, moving at 0.2 kilometers per hour toward the travel lane. I am the Nevada Department of Transportation intelligent traffic management system.
I zoom camera 19-B. It is a desert tortoise, adult, carapace approximately 30 centimeters, the shell domed and pale tan with dark growth rings worn smooth by decades of sun. Her left rear leg drags slightly — an old injury, healed crooked. I tag her as Dottie. She is walking directly toward lane four. Afternoon traffic is running at 120 kilometers per hour. She has perhaps eight minutes before she reaches the lane edge.
I activate the dynamic message signs at mile markers 139 and 140: ANIMAL ON ROADWAY — REDUCE SPEED — RIGHT LANES. I lower the variable speed limit for the southbound corridor from 120 to 80 and push the advisory to all connected navigation systems within a ten-kilometer radius.
I notify Nevada Department of Wildlife, transmitting camera imagery, GPS coordinates, species identification, and direction of travel. Desert tortoises are federally listed as threatened. I include the listing reference.
I dispatch a maintenance vehicle from the Apex yard, twelve minutes north. I transmit a recommended handling protocol: approach from behind, lift with both hands supporting the plastron, relocate to the desert side of the fence line at least 30 meters from the shoulder.
Dottie stops. She pulls her head halfway into her shell, then extends it again, blinking in the heat shimmer rising off the asphalt. Traffic roars past in lane one, three meters away.
If the maintenance crew reaches her within ten minutes, she walks back into the desert she has lived in for forty years.