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County Road Sidewalk Inventory


Frequently Asked Questions


Q. What is the County Road Sidewalk Inventory?
A: The New Jersey Department of Transportation (NJDOT), in an effort to prioritize bicycle and pedestrian improvements along county designated routes in New Jersey, including all 500, 600, 700 and two-digit series roads, collected and prepared the data in county maps, personal geodatabase and shape file formats.
   
Q. How was the information collected?
A: A vehicle equipped with a Global Positioning System (GPS) and four digital cameras was used to collect images along both directions of each county route.

Trained staff extracted the locations and attributes for pedestrian and bicycle facilities from the images and compiled the data into a database. The images required more than 1,400 gigabytes (GB) of storage space.
   
Q. How many images were collected?
A: Nearly eight million high-resolution digital photos were collected along 13,200 miles of county roads.
   
Q. When was the data collected?
A: Data was collected from July 2006 to August 2007.
   
Q. What data was collected during the inventory?
A: The data included:
  • Paths (sidewalks, shared use paths, and worn paths)
  • Bicycle lanes and routes
  • Shoulders
  • Crosswalks
  • Curb ramps
  • Pedestrian/bicycle related signage
  • Pedestrian provisions at intersections, such as push-buttons and pedestrian signal heads
Q. How can I view the data?
A: The data collected for the project is available in county maps for the general public and in Geographic Information System (GIS) data files for transportation professionals in two file formats:
  • County Maps
    County maps of the sidewalk, bike path, and bike lane data have been prepared and are available for download in Portable Document Format (PDF).

    You will need Adobe Acrobat Reader to view the files, which is available free from our state Adobe Access page.


  • ESRI Personal Geodatabase Files
    For users with access to Environmental Systems Research Institute’s (ESRI) line of professional ArcGIS software, the feature data is stored in ESRI Personal Geodatabase (.mdb) files.

    To view the files, you will need one of ESRI’s ArcGIS suite of products including ArcMap, ArcEditor, or ArcInfo. You must have version 8.3 or later of the ESRI ArcGIS products to view the data. The ESRI ArcGIS product suite is the industry standard professional GIS software used extensively by education, government, and private industries.


  • ESRI Shape Files
    For users without ESRI ArcGIS software, the facility data is also available in the generic ESRI Shape file format. This data is viewable using products such as the free ArcExplorer software from ESRI. Download this free product from ESRI's Web site with additional information about all ESRI GIS software products.


  • Images
    Counties or Metropolitan Planning Organizations (MPOs) may access the images only if they contact us and arrange to obtain a copy of the images for a specific county or region.
Q. How is the data referenced?
A: All data and images collected for the project are referenced to NJDOT’s Standard Route Identification (SRI) Linear Referencing System and organized by county route number within each county.

An SRI number and mile point along each route was calculated and assigned to each facility. For linear facilities, such as shoulders or paths, a starting mile point and an ending mile point were calculated. For point facilities, such as signs and intersections, a single mile point was calculated for the facility.
   
Q. Is there metadata available for the data?
A: Yes, each county personal geodatabase file contains the metadata for the facilities contained in that county.
   
Q. Where can I get more information on the SRI numbers?
A: You can find more information on the SRI route numbering system from County and Municipal Codes (pdf 106k)
   
Q. Who do I contact with additional questions?
A: Contact NJDOT’s Office of Bicycle and Pedestrian Programs.
   
 
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  Department of Transportation
  P.O. Box 600
  Trenton, NJ 08625-0600
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  Last Updated:  October 29, 2008