Designing traffic signals at locations along old streets can be a special challenge for traffic signal designers.  In a recent project on San Carlos Avenue, in an area that the utility maps showed no conflicts, the contractor hit multiple conflicts.  A
About a foot below the surface looked like the top of an old retaining wall.  The contractor was curious and kept digging, and about two feet below that hit what looked like the top of another old retaining wall.  (The boot visible in the pictur...
Continue reading ...