Examining the Impact of Adverse Weather on Travel Time Reliability of Urban Corridors in Shanghai

Table 1

Summary of widely used TTR measures.

Category	Measure	Equation
Statistical range methods	Coefficient of deviation [14]
	Travel time variability [15]
	Skew of travel time distribution [16]
	Width of travel time distribution [16]
Buffer time methods	Planning time index [1]
	Buffer time index [13]
	Travel time index [17]
Tardy-trip measures	Misery index [17]
	On-time arrival [17]	Percent of trips with travel time less than 110% or 125% of the median travel time
Probabilistic measures	Frequency of congestion [1]	Frequency of trips experiencing traffic congestion