Skip to main content

Guide to Pedestrian Analysis (2022) / Chapter Skim
Currently Skimming:


Pages 87-108

The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.


From page 87...
... A-1   Estimation of Pedestrian Delay: Uncontrolled Crossings The method presented here is a revised version of the one given in the sixth edition of the Highway Capacity Manual (HCM 6th ed.) , for estimating pedestrian delay at uncontrolled crossings (1)
From page 88...
... A-2 Guide to Pedestrian Analysis The method's computational steps are as follows: • Step 1. Identify two-stage crossings.
From page 89...
... Calculation Details for Analysis Method A-3   where Np = spatial distribution of pedestrians (number of rows of pedestrians) , Nc = total number of pedestrians in the crossing platoon, Wc = crosswalk width (ft)
From page 90...
... A-4 Guide to Pedestrian Analysis The average delay for any pedestrian who is unable to cross immediately upon reaching the intersection (e.g., any pedestrian experiencing nonzero delay) is computed with the following equation: = Equation A-8d d P gd g d where dgd is the average delay for pedestrians who incur nonzero delay and all other variables are as previously defined.
From page 91...
... Calculation Details for Analysis Method A-5   where dp = average pedestrian delay (s) , i = potential yielding event (i = 0 to n)
From page 92...
... A-6 Guide to Pedestrian Analysis Four-Lane Crossing A four-lane crossing follows the same principles as above. The probability of all blocking vehicles yielding on the first potential yielding event is given by Equation A-18: ( )
From page 93...
... Calculation Details for Analysis Method A-7   Equation A-20 does not account for the possibility that some arrivals may come from the intersecting crosswalk as part of a diagonal crossing. Figure A-1a indicates the number assigned to each crosswalk.
From page 94...
... A-8 Guide to Pedestrian Analysis The procedure described in this section is based on the vehicle movement numbering scheme shown in Figure A-2a. These vehicle movement numbers correspond to the signal phase that serves the movement (i.e., Vehicle Movement 2 is served by Signal Phase 2)
From page 95...
... Calculation Details for Analysis Method A-9   • Duration of "Walk" interval for Phase X and Phase Z (s) , • Distance crossed during Phase X [i.e., distance from first corner to far side of median (twostage crossing)
From page 96...
... A-10 Guide to Pedestrian Analysis Step 2. Determine Crossing Time During First Phase The time required to cross from the first corner to the median is determined in this step and is computed with the following equation: = Equation A-24t L S X X p where tX = time for pedestrians to cross during Phase X (s)
From page 97...
... Calculation Details for Analysis Method A-11   crossing is served by Phases 1 and 2. On the basis of Figure A-3, Phase 1 occurs first for the subject crossing direction (X = 1)
From page 98...
... A-12 Guide to Pedestrian Analysis B Compute the Delay Given Arrival Is During "Don't Walk" Interval.
From page 99...
... Calculation Details for Analysis Method A-13   When t ≥ gWalk,X, compute the second-stage crossing delay with the following equation: ( )
From page 100...
... A-14 Guide to Pedestrian Analysis The procedure is based on the following two assumptions: (a) pedestrian arrivals to the first crossing location (i.e., street corner)
From page 101...
... Calculation Details for Analysis Method A-15   B2 B2C4 A8B2 C4 C4D6 B2C4 D6 D6A8 C4D6 A8A8B2 D6A8 B8B8A6 C2B8 C2 C2B8 D4C2 D4 D4C2 A6D4 A6 A6D4 B8A6 6 8 2 4 Corner A Corner BCorner C Corner D (b) Pedestrian movement numbering for Crosswalk 8 (a)
From page 102...
... A-16 Guide to Pedestrian Analysis If the phase providing service to the pedestrians is actuated with a pedestrian signal head and rest-in-walk is enabled, the following equation is used to compute effective walk time: = − − − + 4.0 Equation A-36Walk, , ,g D Y R PCi p i i c i i where Dp,i = duration of Phase i (s) , Yi = duration of yellow change interval for Phase i (s)
From page 103...
... Calculation Details for Analysis Method A-17   As shown in Figure A-5, Phase 2 occurs first for the subject travel direction (X = 2) and Phase 4 occurs second for the subject direction of travel (Y = 4)
From page 104...
... A-18 Guide to Pedestrian Analysis B Compute the Delay for the First-Stage Crossing.
From page 105...
... Calculation Details for Analysis Method A-19   Closing Comments The diagonal crossing procedure described in this section can be used to estimate delay in the diagonal crossing maneuver for a specified travel path (i.e., clockwise or counterclockwise) between two diagonal corners.
From page 106...
... A-20 Guide to Pedestrian Analysis IMC = indicator variable for the presence of a marked crosswalk (1 = present, 0 = not present) , IMR = indicator variable for the presence of a median refuge (1 = present, 0 = not present)
From page 107...
... Calculation Details for Analysis Method A-21   where PD = average proportion of dissatisfied ratings for the crossing (decimal) , Pnd = probability of a nondelayed crossing (decimal)

Key Terms



This material may be derived from roughly machine-read images, and so is provided only to facilitate research.
More information on Chapter Skim is available.