TY  - JOUR
PY  - 2017//
TI  - Influence of signal countdown timer on efficiency and safety at signalized intersections
JO  - Canadian journal of civil engineering
A1  - Biswas, Sabyasachi
A1  - Ghosh, Indrajit
A1  - Chandra, Satish
SP  - 308
EP  - 318
VL  - 44
IS  - 4
N2  - Signal countdown timers (SCTs) are expected to help drivers with better decision-making processes. Because of the inconsistent outcomes from previous studies associated with them, the present study evaluates the influence of SCTs on intersection efficiency and safety by conducting "before and after" study at three signalized intersections located in New Delhi. A methodology is proposed to estimate the start-up lost time at signalized intersections under highly heterogeneous condition. Green signal countdown timer found to have no influence on saturation flow, though its red component helped reduce the start-up lost time significantly. These two components also affect the red light violations at the intersection locations - by increasing violations during the last 10 s red and decreasing them during the initial 10 s of red. Timer-off scenario enlarged total ranges of both Type I and II dilemma zones at the onset of yellow and brought Type II dilemma zone earlier.<p />  <p>Language: en</p>
LA  - en
SN  - 0315-1468
UR  - http://dx.doi.org/10.1139/cjce-2016-0267
ID  - ref1
ER  -