MSTC TERMS - Highway Engineering
(DPWH Manual) Exam Questions and
Answers
Overtaking Lanes - Answer- In flat to rolling terrain, these lanes are used to break up
platoons of traffic and to improve traffic flow over a section of road. A series of such
auxiliary lanes for road. A series of such auxiliary lanes for both directions of traffic can
greatly improve traffic flow and driver satisfaction.
Climbing Lanes - Answer- These can be considered as a special form of overtaking lane
but they are only provided on inclines. These form part of the network of overtaking
opportunities and will therefore have an effect on decisions associated with the location
of other overtaking lanes.
I. Initial diverge taper
II. Auxiliary lane length
III. End or merge taper - Answer- The design of overtaking lanes and climbing lanes
requires the consideration of the:
Diverge Taper - Answer- A taper is required at the start of an auxiliary lane to provide
for the lateral movement of traffic.
Merge Taper - Answer- It is a converging of separate streams into a single stream.
turn-out - Answer- It is a very short section of fully constructed shoulder or added lane
that is provided to allow slow vehicles to pull aside and be overtaken. It differs from an
overtaking lane due to its short length, different signing and that the majority of vehicles
are not encouraged to travel in the right lane.
I. Sand Pile
I. Descending Grade
Ill. Horizontal Grade; and
IV. Ascending Grade. - Answer- Where long steep grades occur, it is desirable to
provide emergency escape ramps. These are to be located to slow or stop an out of
control vehicle away from the main traffic stream. Out of control vehicles result from
drivers losing control of their vehicle. There are four types of escape ramps:
I. Pavement Markings
II. Signs
III. Guide Posts
IV. Reflective Delineators
V. Lighting
, VI. Curb or other physical devices - Answer- Delineation of the road alignment needs to
be considered as part of the design process to ensure that adequate guidance is
provided to rad users. Delineation is generally provided by the use of the following
devices:
I. Unflared and unchannelized intersections (without widening or traffic islands)
II. Flared and unchannelized intersections (with widening but without traffic islands); and
III. Channelized intersections (traffic islands to guide traffic) - Answer- The types of
intersections that generally exist on the road network are:
I. Minimize the speed of vehicles at potential collision points;
II. Separate movements and points of conflict by channelization, or in some situations,
prohibit certain movements (and provide for hem at other intersections along the route);
Ill. Control movements to reduce the possibility of conflict; and
IV. Clearly define vehicle paths by use of pavement markings. - Answer- Principles of
good design to reduce the likelihood of traffic accidents include:
I. Regulatory Signs
II. Traffic signals
Ill. Roundabouts - Answer- Traffic can be controlled at intersections by traffic control
device such as:
Ans.
I. Separate vehicle movements in time. This minimizes conflicts.
II. Minimize delays at an intersection
Ill. Enable vehicles from a side road to cross or enter the major road; and
IV. Assist pedestrians in crossing the road. - Answer- Traffic signals improve safety and
simplify decision making. They also:
I. Minimizing the number of conflict points;
II. Minimizing the area of conflict; Ill. Separating points of conflict
IV. Giving preference to major movements; and
V. Minimizing relative speed of conflicting movements. - Answer- A conflict point occurs
where two travel paths interact or cross. Safe intersection design uses the following
principles:
I. Alignment
II. Road environment
III. Traffic volume and composition
IV. Traffic control devices - Answer- The speed of vehicles through an intersection
depends on:
I. Choosing a layout where conflicting movements cross at angles less than or equal to
90 degrees;
II. Providing a layout or alignment that slows down approaching vehicles; and
(DPWH Manual) Exam Questions and
Answers
Overtaking Lanes - Answer- In flat to rolling terrain, these lanes are used to break up
platoons of traffic and to improve traffic flow over a section of road. A series of such
auxiliary lanes for road. A series of such auxiliary lanes for both directions of traffic can
greatly improve traffic flow and driver satisfaction.
Climbing Lanes - Answer- These can be considered as a special form of overtaking lane
but they are only provided on inclines. These form part of the network of overtaking
opportunities and will therefore have an effect on decisions associated with the location
of other overtaking lanes.
I. Initial diverge taper
II. Auxiliary lane length
III. End or merge taper - Answer- The design of overtaking lanes and climbing lanes
requires the consideration of the:
Diverge Taper - Answer- A taper is required at the start of an auxiliary lane to provide
for the lateral movement of traffic.
Merge Taper - Answer- It is a converging of separate streams into a single stream.
turn-out - Answer- It is a very short section of fully constructed shoulder or added lane
that is provided to allow slow vehicles to pull aside and be overtaken. It differs from an
overtaking lane due to its short length, different signing and that the majority of vehicles
are not encouraged to travel in the right lane.
I. Sand Pile
I. Descending Grade
Ill. Horizontal Grade; and
IV. Ascending Grade. - Answer- Where long steep grades occur, it is desirable to
provide emergency escape ramps. These are to be located to slow or stop an out of
control vehicle away from the main traffic stream. Out of control vehicles result from
drivers losing control of their vehicle. There are four types of escape ramps:
I. Pavement Markings
II. Signs
III. Guide Posts
IV. Reflective Delineators
V. Lighting
, VI. Curb or other physical devices - Answer- Delineation of the road alignment needs to
be considered as part of the design process to ensure that adequate guidance is
provided to rad users. Delineation is generally provided by the use of the following
devices:
I. Unflared and unchannelized intersections (without widening or traffic islands)
II. Flared and unchannelized intersections (with widening but without traffic islands); and
III. Channelized intersections (traffic islands to guide traffic) - Answer- The types of
intersections that generally exist on the road network are:
I. Minimize the speed of vehicles at potential collision points;
II. Separate movements and points of conflict by channelization, or in some situations,
prohibit certain movements (and provide for hem at other intersections along the route);
Ill. Control movements to reduce the possibility of conflict; and
IV. Clearly define vehicle paths by use of pavement markings. - Answer- Principles of
good design to reduce the likelihood of traffic accidents include:
I. Regulatory Signs
II. Traffic signals
Ill. Roundabouts - Answer- Traffic can be controlled at intersections by traffic control
device such as:
Ans.
I. Separate vehicle movements in time. This minimizes conflicts.
II. Minimize delays at an intersection
Ill. Enable vehicles from a side road to cross or enter the major road; and
IV. Assist pedestrians in crossing the road. - Answer- Traffic signals improve safety and
simplify decision making. They also:
I. Minimizing the number of conflict points;
II. Minimizing the area of conflict; Ill. Separating points of conflict
IV. Giving preference to major movements; and
V. Minimizing relative speed of conflicting movements. - Answer- A conflict point occurs
where two travel paths interact or cross. Safe intersection design uses the following
principles:
I. Alignment
II. Road environment
III. Traffic volume and composition
IV. Traffic control devices - Answer- The speed of vehicles through an intersection
depends on:
I. Choosing a layout where conflicting movements cross at angles less than or equal to
90 degrees;
II. Providing a layout or alignment that slows down approaching vehicles; and
