Terminologies page 1-6 Flashcards
an express way is proposed for a road corridor under what situations?
- A road corridor connecting several highly urbanized centers with ribbon-type of development of commercial, business and industrial establishment.
- A road corridor with high traffic demand
roads continuous in extent that form part of the main trunk line system: all roads leading to national ports, national seaports, parks or coast-to-coast roads
National Roads
The elements to consider when planning Expressways are:
- No frontage access;
- Development set well back from the highway;
- Grade separated intersections for extremely high flows and other intersecting expressways;
- Number of intersections to be minimized and;
- Where necessary or for emergency purposes, parking/stopping to be
provided clear of the main carriageway
The elements to consider when planning National Roads are:
- Limited frontage access
- Development set well back from the highway
- All access to premises provided via provincial roads
- Number of intersections to be minimized
- Suitable at-grade channelized intersections for minor flows and other elements
- No roadside vendors
are roads connecting one municipality with another; all roads extending from a municipality or from a provincial or national roads to a public wharf or railway station; and any other road to be designated as such by the Sangguniang Panlalalwigan.
Provincial Roads
Main elements to consider when planning provincial roads
Limited frontage access.
Development set back from the highway;
Most development to be given access via intersections with local distributor roads:
All intersections will normally be at-grade;
Turning traffic should be separated out from the through traffic
Separated pedestrians/bikeways remote from the carriageway
Pedestrian crossing points should be clearly defined and controlled
Parking on the road should not be permitted
Bus stops and other loading areas
Regular stopping places for paratransit vehicles should be identified and safe stopping places established
No roadside vendors.
- these roads / streets within the urban area of the city to be designated as such by the Sangguniang Panglungsod.
City Roads
- these roads / streets within the poblacion area of a municipality to be designated as such by the Sungguniang Bayan.
Municipal Roads
Main paints to consider in planning City/Municipal roads are as follows:
- The road is only for local traffic: through traffic is adequately accommodated an an alternative more direct main road;
*Where possible, an industrial traffic route should not pass through a residential area;
Through crowded streets, approaching intersections at “blind corners”, passing school zones, passing other vehicles which are stationary, or for similar dangerous circumstances, the maximum speed for passenger cars, motorcycles, motor trucks and buses (SPEED)
20kph
High Risk Pedestrian Areas; on roads where there are no footpaths and pedestrians are required to walk on the road
(SPEED)
40kph
Low risk pedestrian areas (SPEED)
60 kph
speed limit would be appropriate on a high standard duplicated carriageway road where there is only occasional access from adjoining properties.
80kph
speed limit would only be appropriate on very high standard expressways, which have a low crash rate.
100 kph
speed limit may also be appropriate on lower standard expressways.
80kph or 90kph
is the maximum number of vehicles, which have a reasonable expectation of passing over a given section of a lane or a roadway in one direction or in both directions during one hour under prevailing road and traffic conditions
Road Capacity
The capacity of a route can be affected by the following factors:
Number of Lanes:
Lane and shoulder width;
Terrain and road gradient;
Traffic composition:
Side friction such as the presence of road furniture and pedestrians;
Intersection capacity
Ideal capacity of a road
2,000 vehicles/hour
Vulnerable road users include: (4)
Pedestrians
People with disabilities
Non-motorized vehicles
Motorcycles
minimum distances from the boundaries of intersecting roads when parallel parking
6m on both approach and exit sides
minimum distances from the boundaries of intersecting roads when Angle parking
12m on approach side, 9m on exit side
The first aim of safe road design is to ensure that road users remain safely on the road. This depends on the following factors:
a sound road surface:
an adequate width or cross-section;
horizontal and vertical alignment;
good visibility/sight distance;
delineation and signing:
provision for pedestrians, pedal cyclists and people with disabilities;
management of traffic conflicts at intersections:
and speed management
Other aspects that could contribute to loss of control on curves are:
(AS, PSD, PSC)
Adverse superelevation;
Poor sight distance;
and Poor surface condition.
The areas where the state of the road surface condition and good texture of the road surface is particularly important
areas where vehicles are required to brake or maneuver suddenly
(like: On the approach to traffic signals, At roundabouts, Around tight curves, On downhill slopes.)
