TRANSPORTATION ENGINEERING Flashcards
The reaction used for road safety design
2.5s
The basic lane width appropriate for national road
3.35 m
It is a maximum number of vehicles, which have a reasonable expectation of passing over a given section of a lane in one direction or in both directions during one hour under prevailing road and traffic conditions
Road Capacity
It is defined as the number of vehicles per unit distance occupying a section of a roadway at a given instant time
Density
The traffic characteristics which has the greatest effect on highway design
Volume of Traffic
The ideal capacity of a road is
2000 vph
Traffic can be controlled at intersection by traffic control device such as
I. Regulatory Signs
II. Traffic Signals
III. Roundabouts
a.) I and II
b.) I and III
c.) II and III
d.) All of the above
All of the above
Device mounted fixed support (Permanent signs) or portable Support (Temporary signs) whereby a specific message is conveyed by means of words or symbols placed or erected for the purpose of regulating , warning or guiding traffic
Traffic Signs
Signs that instruct road users to meet certain traffic rule requirements on road condition
Special Instructions Signs
Signs that inform road users of traffic laws and regulations which if disregarded will constitute an offense
Regulatory signs
Inform and advise road users of directions distance, routes, the location of services and point of interest
Guide signs
Warn road users of condition on or adjacent to the road that may be unexpected or hazardous
Warning signs
Light retro reflecting devices mounted at the side of the road way in series to indicate the roadway alignment
Delineators
Devices which may be conical in shape or tubular shape capable of performing channelization of traffic which may be set on surface of the roadway or rigidly attached for continued use
Traffic cones
Signs used to guide drivers through a change in horizontal alignment of the road
Chevron signs
Standard size shape for regulatory signs
Circle
Standard size shape for directional signs, road work signs, signs for special purposes and supplementary plates for warning signs
Rectangle
Warn advise of temporary hazardous condition that could endanger road users or men nd equipment engaged on road work
Road Signs
Warning devices used to supplement other controls and devices necessary to alert motorist of constructions in the roadway
Flashing lamps
Standard size shape for warning designs
Triangle
Pavement markings shall only be applied and/or removed by:
DPWH
Messages when painted on pavement should be limited to how many words only
Three words or less
A layer of stone shipping coat laid over a hot bitumen to make the surface waterproof
Prime coat
An application of hot bitumen material given to the old surface to provide adhesion to the old and new road surface
Tack coat
A very thin surface applied over a bituminous pavement to make it impervious
Seal coat
