Transport for London (TfL) Recently Conducted a Study to Decide

Multiple Choice

Transport for London (TfL) recently conducted a study to decide whether introducing a new rule imposing passengers to stand on the escalators was the best way to decongest passengers' traffic in some of the busiest underground stations during peak hours. Measurements of traffic were taken in Holborn and Bank stations for 6 months before introducing the new rule and for 6 months afterwards. Results showed a difference in capacity between pre- and post-intervention: the 'standing-only' escalators were able to carry an average of 151 passengers per minute, compared to 115 on the 'walking' escalator, where people were both walking and standing. TfL used a(n) :

A) Factorial design
B) Static group comparison design
C) Correlational design
D) Interrupted time-series design