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The first time Larry Morris spotted the white, blue and orange triangles that seemed to rise up from Blue Grass Road in his Northeast Philadelphia neighborhood, he was unsure just what they were.

“It kind of surprised me,” said Mr. Morris, a retired machine shop welder, “but I slowed down when I went over it, and everyone behind me did too.”

That is exactly what the City of Philadelphia and federal safety officials hope they will do.

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, with DJS Associates, Inc., can be reached via email at experts@forensicDJS.com or via phone at 215-659-2010.