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14 Cards in this Set
- Front
- Back
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Approaches to highway safety
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Exposure control
Injury control Accident control |
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3 types of accident statistics
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Occurrence
Involvement Severity |
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Capacity
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Max number that can be served in a time period
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LOS
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Level of Service, qualitative measure of several factors
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ISTEA
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Intermodal Surface Transportation Efficiency Act
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TEA-21
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Transportation Equity Act for 21st century
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SAFETY-LU
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Safe, Accountable, Flexible, Efficient Transportation Equity Act - Legacy Users
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PHF
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Peak Hour Factor - Peak hourly volume / max rate of flow that hour
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K-factor
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30th peak hour for the year
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TMS
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Time Mean Speed - computed by taking sum of speeds divided by number of vehicles
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SMS
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Space Mean Speed - distance traveled divided by average time to traverse distance
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Greenshield
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flow rate = speed * density
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delay types
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stopped-time, approach delay, control delay, time in queue
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intersection delay studies
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control plus delay to acceleration/deceleration
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