The goal of this study is to investigate the impact of the latest five underground strikes on journey timesin London's transport network during 2009 and 2010. The main data source of this study is AutomaticNumber Plate Recognition (ANPR) cameras, installed on the entrance and the exit of 670 travel links thatcover the vast majority of the network and are equivalent to a total length of 1740 km. The determinationof spatio-temporal differences of strike effects between the first and the remaining strike days, theidentification of changes in departure and arrival times, the estimation of travel time delays within central,inner, and outer London, as well as between inbound and outbound traffic constitute the main objectivesof the study. The total travel time within the examined areas, the excess delay and the correspondingpercentage difference in journey times are the main performance measurements used. The mostsignificant results showed that the second day of strikes resulted in significant delays as opposed to thefirst strike days. The peaks elongated by approximately 45-60 minutes, while the unique full-day strikehad the highest percentage increase in travel times especially during the evening period (74%). CentralLondon was generally affected the most especially during the morning peak experiencing an averageincrease in travel times of 35%, whilst it had the highest percent of negatively affected links (80%). Theinbound traffic experienced, on average, high delays during the morning peak, whereas the outboundtraffic yielded greater delays during the evening period.
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