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Which one factor is affecting to the road alignment?
obligatory point
Stoping sight distance
Overtaking Sight distance
Heavy traffic
obligatory point
Obligatory points are specific locations through which a road alignment must pass due to technical, social, or economic necessity, such as bridge sites, mountain passes, or industrial hubs. These points dictate the primary trajectory of the alignment and override other minor considerations during the initial phase of highway design.
Obligatory points are specific locations through which a road alignment must pass due to technical, social, or economic necessity, such as bridge sites, mountain passes, or industrial hubs. These points dictate the primary trajectory of the alignment and override other minor considerations during the initial phase of highway design.
SSD=vt+2g(f┬▒0.01n)v2тАЛ тАФ Stopping Sight Distance formula
OSD=d1тАЛ+d2тАЛ+d3тАЛ тАФ Overtaking Sight Distance components
The alignment process follows a hierarchy where controlling points are identified first. Engineers select the route connecting these obligatory points while attempting to minimize construction costs and environmental impact, and ensuring the route remains within design standards for sight distance and traffic volume.
Obligatory points are classified as either 'Positive' (must pass through) or 'Negative' (must be avoided).
Sight distance requirements (SSD, OSD) are geometric design constraints, not route alignment determinants.
Road alignment is a three-dimensional problem involving horizontal and vertical profiles.
Traffic volume influences the design speed and highway classification, not the primary alignment path directly.
Minimizes structural costs by connecting viable bridge or tunnel locations.
Ensures connectivity to high-demand socioeconomic zones.
Forcing alignment through specific points may lead to sub-optimal geometric curves.
Potential for high land acquisition costs near urban obligatory points.
Highway surveying and route selection.
Urban planning for regional connectivity.
Mountain road construction planning.
Obligatory points represent the 'constraints' of the alignment problem.
Option B (Stopping sight distance) and Option C (Overtaking sight distance) are geometric design criteria used once the alignment is set, not factors that 'affect' the fundamental path choice.
Option D (Heavy traffic) dictates pavement design and road width, not the route alignment itself.
A is correct тАФ Obligatory points are mandatory locations that dictate the primary route alignment in highway engineering.
Always distinguish between 'Alignment factors' (which determine where the road goes) and 'Geometric design standards' (which determine the shape and safety features of the road once the path is chosen).