Spatial Analysis of Bus Boardings in Montgomery County, MD - Presentation Transcript
Identifying Areas of High Bus Ridership in Montgomery County, Maryland Matt Yeh & Errol Dufour, Greenhorne & O’Mara, Inc.
Program Background
Americans With Disabilities Act (1990)
Title II:
Uniform Federal Accessibility Standards
ADA Standards for Accessible Design
Pedestrian Safety Initiative
Improve physical access
Promote public education
Bus Stop Improvement Program
Prioritization Goals
Can passengers wait at the stop without being in danger?
Are stops reasonably close to a safe street crossing location?
Can/Should the street crossing location be improved?
Can passengers get to the stop along reasonably safe path?
Hazardous Bus Stop
Hazardous Crossing Opportunity
Enhancements
Landing pad
Knee wall
Sidewalk
Curb Cuts
Crosswalks
Bus stop relocation
Before and After ADA Access
Before and After Drainage & Access Issues
Before and After Ped Refuge Island
Program Prioritization
data-driven methods to spatially target specific corridors for improvement (not merely anecdotal)
Sources
Bus stop inventory database
Safety ranking study
Census data
Trip generator/POI GIS data
Ridership values
Ridership Analysis Goals
How can map users easily quantify the amount of riders at each stop?
Present a visual of ridership in order for policy makers to make decisions.
Data limitations
Ridership values may not account for bus stops that have been added or removed
Ridership values are not the most current
Ridership values were manually assigned foreign keys based on bus stop GIS table
Bus stops are not widely dispersed (clustered along main routes)
MONTGOMERY COUNTY RIDEON RIDERSHIP ANALYSIS
Performed a Kernel density
Kernel density computes the density (value per area) of a particular feature in a proposed neighborhood around the features in study.
MONTGOMERY COUNTY RIDEON RIDERSHIP ANALYSIS
Performed a Kernel density
Localized Global
MONTGOMERY COUNTY RIDEON RIDERSHIP ANALYSIS
Why perform a Kernel density?
SCOPE
Kernel density would provide an appropriate prediction of riders based on our concentration of .25 miles.
MONTGOMERY COUNTY RIDEON RIDERSHIP ANALYSIS
Why perform a Kernel density?
APTNESS
A great visual showing the dispersion of riders around the bus stops. It highlights areas with high values of ridership.
MONTGOMERY COUNTY RIDEON RIDERSHIP ANALYSIS Heavy concentration along State Route 97, 586 and U.S. Route 29
MONTGOMERY COUNTY RIDEON RIDERSHIP ANALYSIS Ordinary Kriging - Ordinary Kriging assumes that the data contains a mean which is unknown but remains constant. - Weights for the values in the prediction process are based on the spatial correlation of the data. Correlation between points establishes the estimated value at an unsampled location.
MONTGOMERY COUNTY RIDEON RIDERSHIP ANALYSIS Moran’s I / Measure of Spatial Autocorrelation
MONTGOMERY COUNTY RIDEON RIDERSHIP ANALYSIS Global Ordinary Kriging Localized Ordinary Kriging Ordinary Kriging
Ordinary Kriging
Conclusions
Measure effectiveness of improvement program
Prioritize corridors for improvement by incorporating additional identified parameters
Identify separate set of parameters to find underperforming service areas
What “pull factors” do certain bus stops or trip generators have over others in influencing ridership?
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