--------------------------------------------------------------------- CONTENTS 1. IDENTIFICATION INFORMATION 2. DATA QUALITY INFORMATION 3. SPATIAL DATA ORGANIZATION INFORMATION 4. SPATIAL REFERENCE INFORMATION 5. ENTITY AND ATTRIBUTE INFORMATION 6. DISTRIBUTION INFORMATION 7. METADATA REFERENCE INFORMATION --------------------------------------------------------------------- 1. IDENTIFICATION INFORMATION --------------------------------------------------------------------- 1.1 CITATION (8.1) ORIGINATOR: Illinois Department of Transportation (IDOT) (8.2) CONTENT DATE: ENTIRE YEAR OF 2022 (8.3) PUBLICATION DATE: 28 FEBRUARY 2023 (8.4) TITLE: Illinois Highway System File 1.2 DESCRIPTION 1.2.1 ABSTRACT: This coverage contains highway related information included in the IDOT Illinois Highway Information System (IHIS) -- Illinois Roadway Information System (IRIS). Information is collected for all public highways as defined in Illinois Compiled Statutes (605 ILCS 5/2-202). A separate coverage is provided for each of the 102 counties, each of the 9 IDOT districts, and the state of Illinois. 1.2.2 PURPOSE: IRIS information is collected for two primary reasons -- 1) to qualify for funding and 2) to anticipate and prioritize highway rehabilitation needs. Funding qualification is used to maximize the amount of money available to highway agencies. Anticipating and prioritizing rehabilitation needs helps develop the most effective highway maintenance program possible. Projecting needed improvements is accomplished using IHIS information in conjunction with pertinent information from other sources. These projections are prioritized and combined with funding, manpower and time frame restrictions to determine which rehabilitation projects will be undertaken. 1.3 Time_Period_of_Content: (9.0) Time_Period_Information: (9.1) Single_Date/Time: (9.1.1) Calendar_Date: ENTIRE YEAR OF 2022 1.3.1 Currentness_Reference: date of SQL extract 1.4 Status: 1.4.1 Progress: in progress 1.4.2 Maintenance_and_Update_Frequency: Daily updates, annually posted on web site 1.5 Spatial Domain 1.5.1 Bounding Coordinates 1.5.1.1 West Bounding Coordinate: -88.263 1.5.1.2 East Bounding Coordinate: -87.524 1.5.1.3 North Bounding Coordinate: 42.154 1.5.1.4 South Bounding Coordinate: 41.469 1.6 Keywords 1.6.1 Theme 1.6.1.1 Theme_Keyword_Thesaurus: none 1.6.1.2 Theme_Keyword: roads 1.6.1.2 Theme_Keyword: highways 1.6.1.2 Theme_Keyword: transportation 1.6.2 Place 1.6.2.1 Place_Keyword_Thesaurus: none 1.6.2.2 Place_Keyword: County 1.7 Access_Constraints: none 1.8 Use_Constraints: Reproduction or redistribution of copyrighted digital data sets or products derived therefrom outside of licensees' organization or entity is expressly forbidden. The only exception is redistribution to consultants working for the licensee, and then only for purposes, related to work for the licensee. Such consultants may not further reproduce or redistribute these data sets. None of these data shall be electronically duplicated on magnetic or optical media for use by others, in whole or in part, without permission of IDOT Office of Planning and Programming. Any hardcopies utilizing these data sets shall clearly indicate their source. If the licensee has modified the data in any way they are obligated to describe the types of modifications they have performed on the hardcopy map. Licensee specifically agrees not to misrepresent these data sets, nor to imply that changes they made were approved by IDOT Office of Planning and Programming. 1.9 Point_of_Contact: (10.0) Contact_Information: (10.1) Contact_Person_Primary: (10.1.1) Contact_Person: Michael A. Miller (10.1.2) Contact_Organization: IDOT Office of Planning and Programming (10.3) Contact_Position: Data Management Unit Chief (10.4) Contact_Address: (10.4.1) Address_Type: mailing and physical address (10.4.2) Address: 2300 South Dirksen Parkway (10.4.3) City: Springfield (10.4.4) State_or_Province: Illinois (10.4.5) Postal_Code: 62764 (10.4.6) Country: USA (10.5) Contact_Voice_Telephone: (217) 785-8494 (10.8) Contact_Electronic_Mail_Address: Michael.Miller@illinois.gov 2. DATA QUALITY INFORMATION --------------------------------------------------------------------- 2.1 ATTRIBUTE ACCURACY 2.1.1 ATTRIBUTE ACCURACY REPORT: Highway data is provided for the entire state and local system. Required information and degree of completeness vary for each data element. Administrative and operational information (county, maintenance, functional class, etc.) are provided for all highway segments. Physical characteristics (descriptions and measurements) are provided where applicable -- for example, median data are only available for divided highways. Additionally, the amount of required information and degree of completeness increase for successively higher levels of highway functional classification. Information needs and collection procedures are continually reviewed and revised as necessary to ensure that the most representative value is reported for each applicable data element along a highway segment. 2.2 LOGICAL CONSISTENCY REPORT: This data set contains topologically structured linear data with nodes at all intersections and termini points along the highway system. 2.3 COMPLETENESS REPORT: Information is collected for all public highways as defined in Illinois Compiled Statutes (605 ILCS 5/2-202). A 'public highway' is defined as the entire width, between right-of-way lines, of a highway that is open for public travel. This includes existing and proposed roads as well as dedicated right-of-way, but not roadways or driveways provided by a business or landowner for access to their property. 'Open for public travel' means that public vehicular use of the highway is not prohibited, for reasons other than construction, for more than 90 days in a calendar year. Prohibition can be indicated by gates, fences, signs or other means that restrict access. 2.4 POSITIONAL ACCURACY 2.4.1 HORIZONTAL POSITIONAL ACCURACY 2.4.1.1 HORIZONTAL POSITIONAL ACCURACY REPORT: Accuracy of 1:64,000 analog map based on USGS National Map Accuracy Standards. Information about the roads is referenced down to .01 of a mile. 2.5 LINEAGE 2.5.2.1 Process Description: The roadway information collection activity varies depending on the highway being inventoried. Information for an interstate highway is provided entirely by IDOT agencies. However, information for a local road can come from one or more non-IDOT agencies as well as IDOT, for example county, township or municipal. The district Bureau of Program Development is responsible for coordinating collection activities with agencies in their district. This involves maintaining continual contact with IDOT and non-IDOT agencies to ensure that IRIS information is complete, accurate and up-to-date. The following procedures are provided as guidelines in coordinating these activities. These procedures are suggestions that can be altered to meet the needs of each district. For highways outside of local agency responsibility, contact with other agencies and IDOT bureaus, both district and central, can identify areas of change. Because of the volume of information needed and the miles involved, field review must be kept to a minimum. This can be be accomplished through several methods. First, when construction plans are available, most information can be extracted from them. After reviewing the plans, a quick drive over the road can verify that there is no significant deviation from the plan information. In-field measurements are not necessary unless a problem is suspected. Second, where plans are not available, once an initial inventory is completed, drive through reviews can verify the accuracy of the information. Again, additional in-field measurements are not required unless a problem is suspected. For highways that are the responsibility of local agencies, coordination with the county engineer and township or road district commissioner is sufficient to identify most county and township highway changes. Copies of township or road district maintenance plats, signed by both the county engineer and township or road district commissioner for that township or road district, should be retained in the district office. When a township or road district road is annexed into a municipality, the jurisdiction and maintenance of that section of road must be changed to municipal. In addition, the existence, length and other readily apparent characteristics of local roads "open to public travel" should be verified periodically. This period can vary depending on area growth. But each county needs to be checked at least once every ten years. 2.5.2.3 Process Date: 28 FEBRUARY 2023 2.5.2.6 Process Contact: (10.0) Contact_Information: (10.1) Contact_Person_Primary: (10.1.1) Contact_Person: Michael A. Miller (10.1.2) Contact_Organization: IDOT Office of Planning and Programming (10.3) Contact_Position: Data Management Unit Chief (10.4) Contact_Address: (10.4.1) Address_Type: mailing and physical address (10.4.2) Address: 2300 South Dirksen Parkway (10.4.3) City: Springfield (10.4.4) State_or_Province: Illinois (10.4.5) Postal_Code: 62764 (10.4.6) Country: USA (10.5) Contact_Voice_Telephone: (217) 785-8494 (10.8) Contact_Electronic_Mail_Address: Michael.Miller@illinois.gov 3. SPATIAL DATA ORGANIZATION INFORMATION --------------------------------------------------------------------- 3.2 Direct_Spatial_Reference_Method: Vector 3.3 Point_and_Vector_Object_Information: 3.3.1 SDTS_Terms_Description: 3.3.1.1 SDTS_Point_and_Vector_Object_Type: Point 3.3.1.2 Point_and_Vector_Object_Count: 0 3.3.1.1 SDTS_Point_and_Vector_Object_Type: String 3.3.1.2 Point_and_Vector_Object_Count: 33073 4. SPATIAL REFERENCE INFORMATION --------------------------------------------------------------------- 4.1 Horizontal_Coordinate_System_Definition: 4.1.2 Planar: 4.1.2.2 Grid_Coordinate_System: 4.1.2.2.1 Grid_Coordinate_System_Name: State Plane Coordinate System 4.1.2.2.4 State_Plane_Coordinate_System 4.1.2.2.4.1 SPCS_Zone_Identifier: 1202 4.1.2.4 Planar_Coordinate_Information: 4.1.2.4.1 Planar_Coordinate_Encoding_Method: coordinate pair 4.1.2.4.2 Coordinate_Representation: 4.1.2.4.2.1 Abscissa_Resolution: not determined 4.1.2.4.2.2 Ordinate_Resolution: not determined 4.1.2.4.4 Planar_Distance_Units: FEET 4.1.4 Geodetic_Model: 4.1.4.1 Horizontal_Datum_Name: North American Datum of 1983 4.1.4.2 Ellipsoid_Name: GRS1980 4.1.4.3 Semi-major_Axis: 6378206.4 4.1.4.4 Denominator_of_Flattening_Ratio: 294.98 5. ENTITY AND ATTRIBUTE INFORMATION --------------------------------------------------------------------- 5.2 OVERVIEW DESCRIPTION 5.2.1 ENTITY AND ATTRIBUTE OVERVIEW: The following table identifies elements extracted from the Illinois Highway Information System IRIS subsystem for the HWY01 GIS coverage. This table lists the GIS table name for each element along with its corresponding IRIS data item number and name. For detailed data definitions and collection procedures refer to the IDOT Illinois Highway Information System IRIS manual available from the Office of Planning and Programming. GIS TABLE NAME: IRIS ITEM # - IRIS ITEM NAME AADT : Item 35 - Annual Average Daily Traffic AADT_EST : Item 35 - Annual Average Daily Traffic (Estimated count for internal use only) AADT_YR : Item 34 - Annual Average Daily Traffic Year ACC_CNTL : Item 17 - Access Control BEG_STA : Item 7 - Route Station BLT : Item 14 - Built By CH : Item 47 - County Highway Number CNTYTWP : INV_CO & TWP CO_ADJ : Item 9 - County Adjacent CONG : Item 58 - Congressional District COUNTY_NAM : Translated from INV_CO CRS_LOW : Lowest value between CRS_OPP and CRS_WITH CRS_OPP : Item 42 - Condition Rating Survey CRS_WITH : Item 42 - Condition Rating Survey CRS_YR : Item 46 - Condition Rating Date DIST : Item 6A - District DTRESS_OPP : Item 74A - Pavement Distress DTRESS_WTH : Item 74A - Pavement Distress END_STA : Item 7 - Route Station FAULT_LOW : Lowest value between FAULT_OPP and FAULT_WITH FAULT_OPP : Item 163A - Faulting Height FAULT_WITH : Item 163A - Faulting Height FC : Item 57 - Functional Classification (Illinois 5-Year) FC_NAME : Translated from FC FREIGHT : Item 183 - National Highway Freight Network HCV : Item 75 - Annual Average Daily Heavy Commercial Volume HCV_MU_YR : Item 76 - Annual Average Daily HCV/Multi Unit Volume Year HPMS_SECT : Item 25 - HPMS Section I_SHD1_TYP : Item 22C - Shoulder Inside Type 1 I_SHD1_WTH : Item 21C - Shoulder Inside Width 1 I_SHD2_TYP : Item 22D - Shoulder Inside Type 2 I_SHD2_WTH : Item 21D - Shoulder Inside Width 2 INV_CO : Item 6 - County INVENTORY : Item 0 - Inventory Key Route Identification IRI_LOW : Highest value between IRI_OPP and IRI_WITH IRI_OPP : Item 141A - International Roughness Index IRI_WITH : Item 141A - International Roughness Index JUR_1 : Item 12 - Jurisdictional Responsibility JUR_2 : Item 12 - Jurisdictional Responsibility JUR_TYPE : Item 12 - Jurisdictional Responsibility KEY_RT_APN : Item 174 - Key Route Appurtenance Number KEY_RT_APP : Item 4 - Inventory Key Route Appurtenance Type KEY_RT_NBR : Item 2 - Inventory Key Route Number KEY_RT_SEG : Item 4A - Inventory Key Route Segment KEY_RT_SUF : Item 3 - Inventory Key Route Suffix KEY_RT_TYP : Item 1 - Inventory Key Route Type LN_SPC : Item 16B - Lanes Special Type LN_SPC_NBR : Item 16C - Lanes Special Number LN_SPC_WTH : Item 16D - Lanes Special Width LN_WTH : Item 16A - Lanes Width LNS : Item 16 - Lanes Number MAINT_TYPE : Item 13 - Maintenance Responsibility MARKED_RT : Item 39 - Marked Route MARKED_RT2 : First concurrent marked route MARKED_RT3 : Second concurrent marked route MARKED_RT4 : Third concurrent marked route MED_TYP : Item 54 - Median Type MED_WTH : Item 23 - Median Width MNT_1 : Item 13 - Maintenance Responsibility MNT_2 : Item 13 - Maintenance Responsibility MNT_DIST : Item 29 - District Maintenance MNT_SECT : Item 128 - Maintenance Section MPO : Item 8M - Metropolitan Planning Organization (MPO) MRK_RT_TY2 : First concurrent marked route type MRK_RT_TY3 : Second concurrent marked route type MRK_RT_TY4 : Third concurrent marked route type MRK_RT_TYP : Marked route type calculated as the first position of the Marked Route (I, U, S) MU_EST : Item 75A - Annual Average Daily Multiple Unit Volume (Estimated count for internal use only) MU_VOL : Item 75A - Annual Average Daily Multiple Unit Volume MUNI : Item 5 - Municipality MUNI_ADJ : Item 5B - Municipality Adjacent MUNI_NAME : Translated from MUNI NHS : Item 140 - National Highway System NON_ATTAIN : Item 164 - Nonattainment Area O_SHD1_TYP : Item 22A - Shoulder Outside Type 1 O_SHD1_WTH : Item 21A - Shoulder Outside Width 1 O_SHD2_TYP : Item 22B - Shoulder Outside Type 2 O_SHD2_WTH : Item 21B - Shoulder Outside Width 2 OBJECTID : GIS added key field OP_1_2_WAY : Item 33 - 1 or 2 Way Operation PL_AGY : Item 6B - Planning Agency PRK_LT : Item 67A - Parking Restrictions Left PRK_RT : Item 67B - Parking Restrictions Right REP : Item 59 - Representative District ROAD_NAME : Item 61 - Street/Road Name RUT_LOW : Lowest value between RUT_OPP and RUT_WITH RUT_OPP : Item 142A - Rut Depth RUT_WITH : Item 142A - Rut Depth SEG_LENGTH : Item 7A - Length Shape_Leng : GIS added length field SP_LIM : Item 87 - Speed Zone Speed Limit SPEC_SYS : Item 15 - Special Systems SU_EST : Item 75B - Annual Average Daily Single Unit Volume (Estimated count for internal use only) SU_VOL : Item 75B - Annual Average Daily Single Unit Volume SURF_TYP : Item 18 - Surface Type SURF_WTH : Item 20 - Surface Width SURF_YR : Item 70 - (Most recent) Construction Year TOLL : Item 50 - Toll Facility Type TOWNSHIP_N : Translated from TWP TRK_RT : Item 77 - Truck Route Designation TWP : Item 10 - Township or Road District TWP_ADJ : Item 11 - Township or Road District Adjacent URBAN : Item 8 - Urban Area 6. DISTRIBUTION INFORMATION --------------------------------------------------------------------- 6.1 Distributor: (10.) Contact_Information: (10.1) Contact_Person_Primary: (10.1.1) Contact_Person: Cheryl Kulavic-Knope (10.1.2) Contact_Organization: IDOT Bureau of Information Processing (10.3) Contact_Position: Bureau Chief - Database Administrator (10.4) Contact_Address: (10.4.1) Address_Type: mailing and physical address (10.4.2) Address: 2300 South Dirksen Parkway (10.4.3) City: Springfield (10.4.4) State_or_Province: Illinois (10.4.5) Postal_Code: 62764 (10.4.6) Country: USA (10.5) Contact_Voice_Telephone: (217) 785-5394 (10.6) Contact_Facsimile_Telephone: (217) 782-6211 (10.7) Contact_Electronic_Mail_Address: cheryl.kulavic-knope@illinois.gov 6.3 Distribution_Liability: Illinois Department of Transportation provides these geographic data "as is." IDOT makes no guarantee or warranty concerning the accuracy of information contained in the geographic data. IDOT further makes no warranties, either expressed or implied as to any other matter whatsoever, including, without limitation, the condition of the product, or its fitness for any particular purpose. The burden for determining fitness for use lies entirely with the user. Although these data have been processed successfully on computers of IDOT, no warranty, expressed or implied, is made by IDOT regarding the use of these data on any other system, nor does the fact of distribution constitute or imply any such warranty. In no event shall the IDOT have any liability whatsoever for payment of any consequential, incidental, indirect, special, or tort damages of any kind, including, but not limited to, any loss of profits arising out of use of or reliance on the geographic data or arising out of the delivery, installation, operation, or support by IDOT. 7. METADATA REFERENCE INFORMATION --------------------------------------------------------------------- 7.1 Metadata_Date: 28 FEBRUARY 2023 7.2 Metadata_Review_Date: 24 APRIL 2023 7.3 Metadata_Future_Review_Date: none 7.4 Metadata_Contact: (10.) Contact_Information: (10.1) Contact_Person_Primary: (10.1.1) Contact_Person: Michael A. Miller (10.1.2) Contact_Organization: IDOT Office of Planning & Programming (10.3) Contact_Position: Data Management Unit Chief (10.4) Contact_Address: (10.4.1) Address_Type: mailing and physical address (10.4.2) Address: 2300 South Dirksen Parkway (10.4.3) City: Springfield (10.4.4) State_or_Province: Illinois (10.4.5) Postal_Code: 62764 (10.4.6) Country: USA (10.5) Contact_Voice_Telephone: (217) 785-8494 (10.6) Contact_Electronic_Mail_Address: Michael.Miller@illinois.gov 7.5 Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata 7.6 Metadata_Standard_Version: Version of June 8, 1994 7.7 Metadata_Access_Constraints: none 7.8 Metadata_Use_Constraints: none