Section 2: Condition Diagram
Introduction
A study should be made of existing conditions at the study
location and along each approach to it. Where the location is open
to traffic, the study should include existing traffic control devices
(signs, signals, markings, speed zones, etc.).
Information Sources
The condition diagram should provide a complete presentation
of the physical layout of the study location as it currently exists.
Plan Sheets from Prior Projects.
Final
construction plan sheets from prior projects may be used as a basis
for the condition diagram.Additional Necessary Information
The following items should be included in the condition diagram:
- north cardinal direction
- highway and intersection design features, including:
- pavement edges, curbs, and shoulders (unpaved or paved)
- widths of approaches
- approach grades
- channelization
- parking conditions and restrictions
- bus stops
- safety lighting or continuous lighting
- posted speed limit for all approaches
- any other roadway features which may affect traffic operations
- roadside development, including:
- sight distance restrictions (trees, bushes, advertising and other signs, poles, fences, bridge, and guard rails)
- off street parking
- driveway locations
- utility and other poles
- adjacent land use
- any other pertinent features
- traffic control devices, such as:
- signs
- traffic signals (type, face locations, etc.)
- distance to adjacent traffic signals within one mile (indicate if none)
- pavement markings
- any other traffic control devices
- railroad crossing and type of control
- distance to railroad from traffic signal.