Rethinking Level of Service · 2013. 10. 31. · 1 1 Rethinking Level of Service NACTO –...
Transcript of Rethinking Level of Service · 2013. 10. 31. · 1 1 Rethinking Level of Service NACTO –...
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Rethinking Level of Service
NACTO – Designing Cities
October 29, 2013
Tom Maguire
Assistant Commissioner
New York City Department of Transportation
Three Streets
Level of Service?
B! B!
B!
Intersection LOS is a measure of delay aggregated across a group of drivers under specific traffic conditions… so it’s good for evaluating engineering decisions:
• How well have I allocated signal time and phases at an intersection?
• How well have I allocated vehicle lanes among competing drivers?
Engineering or Planning?
Intersection LOS is a measure of delay aggregated across a group of drivers under specific traffic conditions… so it’s bad for evaluating planning decisions:
• How safe is this street?
• How well does this street work for pedestrians, bus riders, and cyclists?
• How well does this street work for all drivers?
Engineering or Planning?
Why do we use a metric suited to engineering individual intersections to plan entire streets, an even entire cities?
Engineering or Planning?
Our Metrics Must Evolve
Our Metrics Must Evolve
Mobility – Automobile
Safety
Access/Mobility – Multimodal
Public Health
Economic Development
Environmental Quality
Livability/Quality of Life
• Volumes (ATR, MTC, class’n) • Vehicular LOS (delay, V/C, etc)
METRICS
• Crash Total (all, by mode, etc) • Exposure (crashes/volume)
• Multimodal volumes & LOS • Curb/parking availability
• Minutes/physical activity/day • Rates of obesity, diabetes, etc
• # of businesses, employment • Retail sales, visitor spending
• Air quality, water quality • Urban heat island, energy
• User satisfaction • “Staying” activities, events
Crash reduction
Better metrics: For all users
West 181st Street,
Manhattan
Crash reduction
Better metrics: For all users
Transit ridership
Better metrics: For all users
First Avenue,
Manhattan
Transit ridership
Better metrics: For all users
Transit ridership
Better metrics: For all users
Economic benefits
Better metrics: For all users
Vanderbilt Avenue, Brooklyn
Economic benefits
Better metrics: For all users
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Improvement Site
Neighborhood Comp's
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Accessibility
Better metrics: For drivers
Accessibility
Better metrics: For drivers
Reliability
Better metrics: For drivers
Fifth Avenue, Manhattan
Same street, same block, same peak, same day… which will you experience?
Reliability
Better metrics: For drivers
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5th Avenue [49th St to 42nd St] Non-holiday weekdays | September - November 2011
Reliability
Better metrics: For drivers
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5th Avenue [49th St to 42nd St] Non-holiday weekdays | September - November 2011
In rush hours, speeds are slow, but variability is very low (the “bad” days are not very different from the typical days)
Reliability
Better metrics: For drivers
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Hour of the day
5th Avenue [49th St to 42nd St] Non-holiday weekdays | September - November 2011
Mid-days are more variable at both high and low speed ends, but most days (25th-75th percentiles) stay within fairly tight bands.
Reliability
Better metrics: For drivers
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Time of Day
5th Avenue [49th St to 42nd St] – PM PEAK
Questions? Tom Maguire [email protected]