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17 Cards in this Set
- Front
- Back
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The maximum speed that can be maintained over a specified section of the highway when weather and traffic conditions are so favorable that the design feature of the highway govern |
Design Speed |
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AASHTO |
American Association of State Highway and Transportation Officials |
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Economical Speed |
30 - 50 kph |
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Selection of proper design speed : sets the limits for |
- Curvature - Sight Distance - Other Geometric Figures - Limited Funds |
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AASHTO Classification |
- Rural or urban - Freeways, arterials, collectors and locals - Rural collectors and local facilities: flat, level, rolling or mountainous |
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80 kph up to 120 kph to guarantee future obsolescence of highway as well as the increased margin of operating safety |
Design Speed |
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The cross section of a typical highway has a latitude of variables to consider, such as: |
- Volume of traffic - Character of the traffic - Speed of the traffic - Characteristics of motor vehicles and of the driver |
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It usually adopt a cross section that is uniform in thickness from end to end of the improvement |
Highway Design |
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Highway design usually adopt a cross section that is uniform in __________ from end to end of the improvement. This is acceptable on high volume traffic roaf facilities |
thickness |
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For a low or reconstruction of old roads, modification of the features such as the shoulders width in rough areas are usually employed to _________________ |
reduce the costs |
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A drive instinct when overtaking, allowing other cars to overtake or meeting oncoming vehicles, is to look at the _______ ______ ___ ___ _________, and see the ___ ___ ___ ________ where to position his car. |
A drive instinct when overtaking, allowing other cars to overtake or meeting oncoming vehicles, is to look at the surface width of the highway, and see the kind of the surface where to position his car. |
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Originally, the total surface width of the road was only ____________, but with the increased use of vehicles, the width was increased to ____________ then to ____ _______. |
Originally, the total surface width of the road was only 4.50 meters, but with the increased use of vehicles, the width was increased to 4.80 meters then to 5.40 meters. |
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Later, the width of the road was standardized at ____________ wide for first class paved one lane highway, and now, a ___________ wide surface is adopted as standard for freeways and other major traffic roadway, although there are strong demands to increase it further from ____ to ____________ |
Later, the width of the road was standardized at 3.00 meters wide for first class paved one lane highway, and now, a 3.60 meter wide surface is adopted as standard for freeways and other major traffic roadway, although there are strong demands to increase it further from 3.60 to 4.20 meters |
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2 Lane rural highways |
7.20 meters wide surface |
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Collector Roadway |
6.00 meters wide |
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Local Rural Roadway |
4.80 meters minimum width for a 30 kpg design speed |
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Urban Roadway |
3.60 meters although 3.00 meters is allowed where space is limited |
