GATE Civil Engineering (CE) 2014 Shift 2 Solved Paper

A pre-timed four-phase signal has a critical lane flow rate for the first three phases as 200, 187 and 210 veh/hr with a saturation flow rate of 1800 veh/hr/lane for all phases. The lost time is given as 4 seconds for each phase. If the cycle length is 60 seconds, the effective green time (in seconds) of the fourth phase is ______________