City Engineer Jeff Steinkamp has seen all sorts of crazy things involving motorists who encounter construction sites along local streets.

Out of concern for the public’s safety, he finally issued a plea this week.

“Please, citizens of Quincy, do not drive around barricades or barriers — or move them,” Steinkamp said in an interview after Monday night’s Quincy City Council meeting. “I was out on a job site today and I tell you, they just drive around them, drive right up to the hole in the street and stare are you like, ‘What?’ ”

Steinkamp implores local motorists to “obey the barricades.” They’re there for a good reason — to keep cars out.

“It’s a city ordinance,” he said. “You can’t drive around a barricade. And don’t move them. I’ve seen guys get out of their car, slide the barricade to the side, go on by, and not even slide it back. Then here comes another string of cars. You just wouldn’t believe what you see out there.”

So he is beseeching the public: “Watch the construction zones. Don’t drive around barricades and don’t move barricades. It’s just for their own safety.”