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| Manual on Uniform Traffic Control Devices |
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1. Fulfill a need 2. Command attention 3. Convery a clear, simple message 4. Command Respect of Road Users 5. Give adequate time for a proper response |
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1. Traffic Accident Studies 2. Traffic Counts 3. Spot Speed Study 4. Origin Destination Surveys 5. Parking Studies 6. Inventory Studies |
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| Traffic Collision Studies |
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| cop gives first analysis of crash |
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Automated=Automatic Traffic Recorders (ATRs)
Manual |
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| Want a ratio of 85% of drivers adhering to speed limit. |
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| Origin Destination Surveys |
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a. inventory b. usage studies -duration -accumulation -vehicle classification study |
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a. signs b. signals -550 signalized intersections in nashville -1300 unsignalized intersections |
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R- regulatory (stop signs, speed limit) W- warning (school bus, deer crossing) G- (guide) |
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-shall means mandatory -should means advised -may means allowed |
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-Lane (W/Y) -Hazard -Pedestrian -Words |
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-Need to see 2 signals at an intersection -used to have bulbs (idiots) -Now have LEDs (Light Emitting Diodes, tight) -Cycle Length, C (G-Y-R-G) -Φ Phase Intervals- 1 display |
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| Cost of signalizing intersection? |
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| Stop sign intersection car handling capability |
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| 1600 vph until one side gets too heavy flow |
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| Most efficient way to get cars through an intersection |
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measured by: -speed -density -volume -vol/capacity -delay |
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| Master intersection has the shortest green |
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| Intelligent Vehicle Highway System |
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| Intelligent Transportation Systems |
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| GPS, on-star, EDR (electronic data recorder), airbags (deploy @ 14mph), anti-collision sensors, active anti-roll, vehicle stabilizers, ABS |
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| Traffic Signal Optimization |
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1. Reduce Volume 2. Reduce Speed 3. Reduce Truck Traffic 4. Reduce Collisions |
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