An index map used in a Highway project shows
- AThe proposed and existing roads and important places to be connected.Correct
- BDetails of alternate alignments.
- CThe general topography of the area.
- DThe general details of existing structures like buildings, well etc.
Solution
Concept
Information shown on highway index map
Formula
NONE
Step-by-step solution
1. An index map is a small-scale key map prepared during highway project planning. 2. It provides a general overview showing existing road networks, proposed highway alignments, and key towns or places connected. 3. Detailed topographic and structural features are portrayed on key maps or detailed site maps rather than index maps. Answer: A
Explanation
An index map provides a macro-level overview of a proposed highway project for planners and engineers. It displays existing roads, proposed routes, major towns, and key geographic landmarks across the project area. This makes option A the correct definition of an index map.
Why the other options are wrong
B) Details of alternate alignments are shown on preliminary survey plans rather than index maps. C) General topography is shown on topographical maps. D) Details of existing structures are depicted on detailed site plans.
Shortcut
Index Map = General overview connecting important places and proposed/existing roads.
Common mistake
Confusing an index map with a key map or topographic plan showing physical details and contours.
Correct answer: A) The proposed and existing roads and important places to be connected.