Markowitz, F., Sciortino, S., Fleck, J. L. and Yee, B. M. (2006). “Pedestrian countdown
                           signals: Experience with an Extensive Pilot Installation.” Institute of Transportation
                           Engineers, ITE Journal, Vol. 76, No. 1, pp. 43-48.Markowitz, F., Sciortino, S., Fleck,
                           J. L. and Yee, B. M. (2006). “Pedestrian countdown signals: Experience with an Extensive
                           Pilot Installation.” Institute of Transportation Engineers, ITE Journal, Vol. 76,
                           No. 1, pp. 43-48.
