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18 Cards in this Set
- Front
- Back
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Four Modes of Transportation
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Air
Waterborne Pipeline Surface |
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Transportation
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Safe and efficient movement of people and goods in an environmentally friendly way.
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Transportation Engineering is:
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POLICY
PLANNING: Geometric Design Operational Analysis Safety |
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Media That traffic engineers use to communicate with drivers
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markings
signs signals |
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MUTCD requirements
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FULFILL a need
COMMAND attention CONVEY a clear and simple meaning COMMAND respect of road users GIVE adequate time for response |
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(4) Mechanisms to convey information to drivers
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Color
Pattern Shape Legend/Symbols |
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traffic markings
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Longitudinal - mandatory conditions
Transverse - across path of travel Object markings/Deliminators - |
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traffic signs
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Regulatory - Black legend on White
Warning - Black Legend on Yellow Guide - White Legend on Green, Blue, Brown |
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Roadway design is governed by two main factors
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Vehicle capabilities
Human capabilities |
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AASHTO deceleration rate
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11.2 ft/sec^2
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AASHTO Reaction Time
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2.5 seconds
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Gravitational Constant
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32.2 ft/sec^2
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MPH to Ft/Sec
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1.467
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Four Criteria Establishing Length of Sag Curve
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Headlight sight distance
Passenger comfort Drainage control General appearance |
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Headlight Location
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2 Ft high and 1 degree angle up
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Recommended max super elevation
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12 percent
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Maximum Rates of Superelevation
Controlled by four factors: |
Climate conditions (snow/ice regions)
Terrain conditions (flat, rolling, mountainous) Type of area (rural, urban, suburban) Frequency of very slow-moving vehicles |
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Average urban super elevation
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4 or 6 percent
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