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**NEW - March 2015** Abbreviated Interchange Operations Study (IOS) Information:
 
Studies: IJS/IMS/IOS
Interchange Justification Studies/Interchange Modification Studies/Interchange Operations Studies
 
Purpose of an IJS/IMS/IOS
Control of access on the Interstate and other freeway systems is considered critical to providing the highest quality of service in terms of safety and mobility. Sometimes referred to as an Access Point Request, these studies are needed on Interstate and other freeway systems in accordance to Federal Code 23 U.S.C. 111 and FHWA Policy - Additional Interchanges to the Interstate System (Federal Register: February 11, 1998, Volume 63, Number 28).
The documentation required depends on the type of change requested - new or revised. New Access is the addition of a point of access where none previously existed. This includes the construction of an entirely new interchange such that it will result in additional points of access or additional ramps to existing interchanges. As an example, the reconstruction of an existing diamond interchange to a full cloverleaf interchange would add four new points of access.
Revised Access is the revision of existing ramps or crossroads within the limited access area such that the number of access points will remain the same but the operation and/or safety of the Interstate/freeway system may be affected. The changing of a cloverleaf interchange to a fully directional interchange, the adding of turn lanes at crossroad-ramp intersections, the adding of through lanes on the crossroad through an interchange, or the widening of a single lane entrance ramp to two lanes are considered examples of revised points of access.
New or revised access point requests require the preparation and processing of an Access Point Request Document. Generally, new access requires an Interchange Justification Study (IJS), and revised access requires either an Interchange Modification Study (IMS) or an Interchange Operations Study (IOS). Ultimately, the study is going to demonstrate that the modification to the Interstate will not degrades its capacity or safety.
Prequalification Requirement
There is a prequalification requirement for consultants who want to prepare interchange justification and modification studies (more info...)
 
Traffic Academy Resources

​​FAQ.pdfFAQ.pdf

Sample IMS CUY-480 Tiedeman (Report Only).pdfSample IMS CUY-480 Tiedeman (Report Only).pdf

Sample IMS with Addendum HAN-75-14 39.pdfSample IMS with Addendum HAN-75-14 39.pdf

Traffic Academy 2016 Course Manual - Interchange Studies.pdfTraffic Academy 2016 Course Manual - Interchange Studies.pdf
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 IOS Examples

 
  
  
  
  
  
ATH-33-14.99 (State St.); PID 97237.pdf
10
  
8/3/2016 8:30 AMNo presence informationDon Fisher
BEL-149-23.79; PID 99042.pdf
11
  
8/3/2016 8:31 AMNo presence informationDon Fisher
BEL-7-18.07; PID 99087.pdf
11
  
8/3/2016 8:31 AMNo presence informationDon Fisher
BUT-I-75-Tylersville.pdf
8
  
8/3/2016 8:31 AMNo presence informationDon Fisher
CLA-40-10.11; PID 99779.pdf
7
  
8/3/2016 8:31 AMNo presence informationDon Fisher
CUY-82-3.54 (I-71); PID 99435.pdf
12
  
8/3/2016 8:31 AMNo presence informationDon Fisher
FRA-104-7.57 (at I-71), PID 99885.pdf
6
  
8/3/2016 8:32 AMNo presence informationDon Fisher
FRA-315-2.12 (OlentangyGoodale).pdf
6
  
8/3/2016 8:32 AMNo presence informationDon Fisher
HAM-275-SR-4; PID 101575.pdf
8
  
8/3/2016 8:32 AMNo presence informationDon Fisher
LAW-52-Solida; PID 97484.pdf
9
  
8/3/2016 8:32 AMNo presence informationDon Fisher
LIC-016-18.20; PID99478.pdf
5
  
8/3/2016 8:32 AMNo presence informationDon Fisher
MOT 70 3.34; PID 99623.pdf
7
  
8/3/2016 8:33 AMNo presence informationDon Fisher
MOT-I-75-0.76; PID 99213.pdf
7
  
8/3/2016 8:33 AMNo presence informationDon Fisher
SUM-08-1.75 (Perkins St.-Glenwood Ave.); PID 91710.pdf
4
  
8/3/2016 8:33 AMNo presence informationDon Fisher
WAR-71-SR-48.pdf
8
  
8/3/2016 8:33 AMNo presence informationDon Fisher