The purpose of a Traffic Impact Study (TIS), prepared for submittal to the Maryland State Highway Administration (SHA), is to review impacts of the proposed development on the State Highway System, generally in conjunction with the issuance of an access permit. The evaluation should consider traffic capacity, signalization and safety issues. This report will be used to determine the needed improvements in the vicinity of the site access and provide data to the State (and local jurisdictions) on what off-site improvements need to be considered.
The following are intended as guidelines for preparing a traffic impact report for developments which will affect the State Highway system. Traffic reports prepared for the counties should include analyses consistent with these guidelines when state roadways are involved. Some counties have guidelines of their own and these are not intended to replace those guidelines, but rather supplement them.
A TIS may be required for any development that generates more than 50 peak hour trips. For any TIS prepared as a requirement of local jurisdiction guidelines, with a lower threshold, SHA would expect the report to conform to these guidelines when State highways are involved.
Once it is determined that an impact study is required, a scoping meeting may be held with the developer or his consultant and the appropriate representatives of the SHA and/or local jurisdiction. It will be the responsibility of the consultant to initiate this meeting, working through SHA's Engineering Access Permit Division (EAPD). The purpose of this meeting is to discuss site specific information concerning the development. All interested parties should receive copies of the minutes from this meeting.
The study area should generally be in accordance with Local Adequate Public Facilities Ordinance (APFO) guidelines which may be modified during the scoping meeting in consultation with SHA. In the absence of local guidelines, the network should be analyzed to the nearest signalized public street intersection in all directions from each access point; generally not greater than one mile from the access point(s).
An Impact Study Report should include the following information:
The following is a more detailed explanation of the various aspects involved in preparing the report:
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