What is the Michigan Department of Transportation PR Finder?
 PR Finder is an interface which allows end users to “find” Physical Road (PR) information for all roads in the state of Michigan. The numerous search options available will serve to meet most queries, whether they are geographic in nature (road name, intersection name or direct map search) or a search by using known linear referencing information such as a PR number or Control Section (CS) number.
What is a Physical Road (PR) Number?
PR Number is a part of a common linear referencing system used statewide to uniquely identify any point or section of roadway within Michigan’s transportation network. The PR number is a unique value given to a section of roadway, this can then be followed by an exact mile point in order to pinpoint a location or a beginning mile point (BMP) and ending mile point (EMP) can be listed to identify a section of roadway.
What is a Control Section (CS) Number?
A CS Number is a part of a common linear referencing system used by the Michigan Department of Transportation, it is similar to PR numbers but its coverage includes only the state trunkline system.
I found my location on the map, how do I retrieve the PR (or CS) information?
After you have navigated to the desired location within the map, look for the PR/CS Info icon on the top of the page. Select this button and then point and click on the map (on a roadway) to obtain the PR/CS Information, the results will pop a new window with the details.
How do I save my results?
Some results are tabular while others are an informative map. The tabular results can be saved to an excel spreadsheet by clicking on the excel icon at the top of the search results. The map results can be printed by selecting the Print button.
How do I find traffic volume (AADT) information?
Browse to your area of interest via the Map Search features; you can then activate the “Avg Annual Daily Traffic tab directly below the map to display traffic volume information. Expand (+) the “Map Legend” on the right side of the screen to obtain detailed information about the map you are viewing. Commercial traffic volumes can be viewed in the same fashion by selecting the “Comm. Avg. Daily Traffic”.
How do I find/view National Functional Classification (NFC) information?
Browse to your area of interest via the Map Search features; you can then activate the NFC tab (Natl. Functional Class) directly below the map to display NFC information. You can then expand (+) the “Map Legend” on the right side of the screen to obtain detailed information about the map you are viewing.
Who can I contact for further help?
Please contact Cory Johnson at 517-335-2931 or Johnsonc45@michigan.gov.
I am browsing the map and can’t find the bridge I am looking for?
When searching for bridge information via browsing the map, remember to turn on the bridge layer by expanding (+) the “Map Layers” tab on the right side of the screen. Once expanded, you will see a “Bridges” selection box; this will turn on a visible bridge layer to assist you. Now that you have this layer activated, you will be able to utilize the “Bridge Info” icon tool on the toolbar above the map window. Simply select the “Bridge Info” icon button and then point and click on the bridge of interest (you will need to navigate the map to find your area/bridge of interest); your search result will pop up in a small window. Tip: Be careful not to turn layers on and off too quickly, be patient.
I need Bridge information, how do I find it?
When searching for bridge information you have two options; a text search and a map search. For map search methodology, see above. When performing a text search for bridges, you have several options once you navigate from the main page to the text search and bridge tab to narrow your search: entering the structure number (STRU) if you already have it, a road name or control section number (trunkline only), and even a search by watercourse is possible. One last option is to search by MDOT Region, TSC or County; this will produce all bridges within your selection criteria.
How do I find interchange information on the map?
If you are searching the map for interchange information you should turn on the Interchange and Ramp layers by expanding (+) the “Map Layers” tab on the right side of the screen. Once expanded, you will see “Interchange” and “Ramp” check boxes that you can select to activate these layers. Once activated these layers will display interchange details on the map. You can use the “Bridge Info” icon tool to directly query an Interchange icon which appears as a small white square similar to those that appear on the annual MDOT Michigan Map. There are other methods for searching for interchanges, please read the next example.
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