To assess the coordinate system, the Cartographic Coordinate System environment is used if it is set; otherwise, the coordinate system of the map is used. If neither of these are available, the coordinate system of the input layers is used.

Dividedhighway example

Matched pairs of roads or lanes are merged if they are the same road class, trend generally parallel to one another, and are within the merge distance apart. The road class is specified by the Merge Field parameter. All nonmerged roads from the input collection are copied to the output feature class.

Empty or null geometry—The input features must consist of valid geometries. If features with zero or null shape length are detected, a warning is issued and these features are ignored by the tool. The ObjectIDs of features with empty or null geometry are written to a log file named EmptyGeom#.txt (where # is a numeral that increases incrementally with each log file generated). If necessary, use the Repair Geometry tool to repair these features.

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Geometry below the XY tolerance—In some cases, features in the data may be below the x,y tolerance specified in the map or in the environment of the tool. If features with lengths below the tolerance are detected, a warning is issued and these features are ignored by the tool. The ObjectIDs of features with geometry below the tolerance are written to a log file named GeomBelowTolerance#.txt (where # is a numeral that increases incrementally with each log file generated).

Undividedroad

Reference scale—Ensure that the reference scale is set to specify the Merge Distance parameter in page units (pt, in, mm, cm).

Self-intersecting features—Input line features that cross over themselves or share common start and endpoints may cause unexpected results. Create a topology with the Must Not Self-Intersect line rule to identify these areas. If self-intersecting features are detected, a warning is issued, but the tool will continue to process. The ObjectIDs of self-intersecting features are written to a log file named SelfIntersect#.txt (where # is a numeral that increases incrementally with each log file generated).

Dividedhighway vs undivided

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Nondividedhighway

Assign attribute values as follows: 0—Traffic circles or roundabouts1—Carriageways, boulevards, dual-lane highways or other parallel trending roads2—On- or off-ramps, highway intersection connectors999—Features that should not merge

DividedHighway Ends sign

Caution:In cases where very small segments of otherwise parallel-trending, equal merge value roads have incompatible values, the roads will be merged together for their entire length. The assumption is that these small anomalies are data attribution errors and not reflective of an actual change in road classification. In cases where these situations are detected, a warning message is raised and the segments in question, along with other inconsistent segments, are written to a log file named InconsistentValues#.txt (where # is a numeral that increases incrementally with each log file generated).

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This tool is generally most effective when used in conjunction with other generalization and graphic conflict resolution tools.

A warning is issued if the input features are not in a projected coordinate system. This tool relies on linear distance units, which will create unexpected results in an unprojected coordinate system. It is recommended that you run this tool on data in a projected coordinate system to ensure valid results. An error occurs and the tool will not process if the coordinate system is missing or unknown.

This tool operates contextually such that both adjacent and connecting features are considered when determining the final state of each individual feature. Using a large amount of input data can exceed memory limitations. To avoid this limitation, consider enabling partitioning when running this tool by specifying a partition feature class in the Cartographic Partitions environment. When partitioning is enabled, the tool sequentially processes the data in logical and manageable chunks. The input features delineated by each partition polygon are loaded into the tool, along with additional data from a buffer zone surrounding the partition. The additional data is considered as processing proceeds. This ensures that the resulting feature classes are seamless, and the states of features spanning across partition boundaries are consistent.

Roaddivider

When an input road feature exactly follows a partition boundary, for example, a road follows the county line and counties are the partition feature class, the road will appear twice in the output, once for each adjacent partition processed.

In the Windows operating system, log files that are generated when warnings or errors are issued are written to C:\Users\\AppData\Local\ESRI\GeoProcessing.

False dead ends—A false dead end is an unconnected segment that appears visually connected when symbolized at the final map scale. These may be areas where you expect connectivity based on visual appearance, but features are not actually connected. If you run the tool without repairing the connectivity, unexpected disconnects may be visually apparent in the results. Any endpoint that is within 0.5 millimeter from another line segment is detected as a false dead end, taking into account the reference scale. If false dead ends are detected, a warning is issued, but the tool continues to process. Detected false dead ends are written to a log file named DeadEnd#.txt (where # is a numeral that increases incrementally with each log file generated).

When processing the Merge Divided Roads tool by partition, the resulting roads from each partition are appended into the output feature class. The roads will be split at the partition edges. Where merged roads are created, they are snapped at a common node at the partition boundary. Every effort is made to ensure consistent results across partition boundaries, but it is possible that in geometrically complex or dense areas, there may be situations where a road is snapped to an incorrect road, or a road is merged in one partition but not when it crosses into another. By adding the additional fields to the input feature class outlined below (short or long integer), you can query and display potential issues. These fields will be present and populated in the output feature class. MDR_TYPE—A value of 1 specifies a merged road.A value of 0 specifies that the feature is not a merge candidate.A value of -1 specifies that the feature is parallel on its left side to another feature (when considering the direction of a feature from its from-node to its to-node).A value of 1 specifies that the feature is parallel on its right side to another feature (when considering the direction of a feature from its from-node to its to-node).A value of 2 specifies that the feature is parallel on both sides to other features.MDR_SNAPA value of 0 specifies that the tool did not need to make any snapping decision.A value of 1 specifies that a snap larger than the tolerance was necessary to ensure continuity at a partition boundary.A value of 2 specifies that the tool had difficulty determining the correct node to use for snapping in ambiguous configurations. These areas should be examined to verify or modify the continuity of merged roads across partition boundaries.

If the reference scale is unavailable, a value twice the tolerance of the spatial reference is used to detect false dead ends.

Divided roadsign

Single-part features—The input features cannot contain multipart features. Use the Multipart To Singlepart tool or create a topology with a Must Be Single Part line rule to convert features to single part.

Single carriageway

This tool is generally used to simplify a relatively large-scale road collection at a smaller scale, where it is appropriate to depict divided highways and boulevards as a single line. At medium scales, it may be preferable to retain divided roads as separate features. In this case, you can use the Resolve Road Conflicts tool instead to ensure that symbolized lanes are displayed without symbol conflicts. If both the Resolve Road Conflicts and Merge Divided Roads tools will be run on the same collection of roads, it is recommended that you run Merge Divided Roads first.

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This tool is optimized for the spatial relationships typically found in a road network. Unexpected results may be produced if the tool is used to process other themes. It is important that the geometry of the input features is correctly established for the tool to maintain the relationship of the features as they coexist in a road collection. Take note of the following input data requirements and suggestions:Caution: A warning is issued if the input features are not in a projected coordinate system. This tool relies on linear distance units, which will create unexpected results in an unprojected coordinate system. It is recommended that you run this tool on data in a projected coordinate system to ensure valid results. An error occurs and the tool will not process if the coordinate system is missing or unknown.

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Track merged features—To determine which features were detected as equal class and trending parallel for an adequate distance, add a field called MDR_TYPE (short or long integer) to the input feature class. This field will be copied to the output feature class. In the input feature class, matched pairs of roads that will be merged are coded MDR_TYPE = 1 and MDR_TYPE = -1. In the output feature class, the resulting merged road is coded MDR_TYPE = 1. You can use this information for quality control checking or to identify features that may need different symbology for a more appropriate depiction.

In cases where very small segments of otherwise parallel-trending, equal merge value roads have incompatible values, the roads will be merged together for their entire length. The assumption is that these small anomalies are data attribution errors and not reflective of an actual change in road classification. In cases where these situations are detected, a warning message is raised and the segments in question, along with other inconsistent segments, are written to a log file named InconsistentValues#.txt (where # is a numeral that increases incrementally with each log file generated).

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Establish road classifications appropriately. The Merge Field parameter is used to identify unique classes of roads. This will likely correspond to or be the same as the field that you use to symbolize the roads. For parallel roads to merge, they must have the same, nonzero integer merge value. If one or both features in a parallel pair have a merge value of 0, they will not be merged. The data type of the field must be short or long integer.

Specify road character—To improve the results, consider populating a dedicated field (short or long integer) with values specifying road character or shape and supplying this field to the Road Character Field parameter. This attribution helps the tool assess which pairs of features make good candidates for merging, or conversely, assess which features should not be merged. Not all values need to be populated.

Shared segments—Input features should not overlap one another so that they share segments. Create a topology with the Must Not Overlap and Must Not Self-Overlap line rules to resolve these issues. If the tool is being run with more than one input layer, create a topology with the Must Not Overlap With rule. If shared segments are detected, a warning is issued, but the tool continues to run. The ObjectIDs of the features involved are written to a log file named SharedGeom#.txt (where # is a numeral that increases incrementally with each log file generated).