Federal-aid Legislation
Federal Aid Road Act of 1916 Creation of a Landmark (.pdf, 1 mb)
General
Legacy ID
21
The Interstate System
History
Highway History
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Interactive Highway Safety Design Model (IHSDM): User Applications and Case Studies
Over the past 2 decades, State and local agencies—and their consultants—the Federal Highway Administration’s (FHWA) Office of Federal Lands Highway, and many others have used IHSDM for a host of applications. This page provides summaries of select applications/case studies.
State Resources
For Local Information: Consult Your FHWA Division Office for State Resources
Your FHWA Division will provide the contacts to access the following State Resources: Links to local program websites, manuals and references, Local Technical Assistance Program (LTAP) centers, and local...
Federal-aid Essentials for Local Public Agencies
Federal-aid Simplified....
Interactive Highway Safety Design Model (IHSDM): Events
Past Events
Webinars
Interactive Highway Safety Design Model (IHSDM) 2021 Software Release Webinar
An FHWA-...
Interactive Highway Safety Design Model (IHSDM): User Group
User Group Purpose
The Federal Highway Administration (FHWA) established the Interactive Highway Safety Design Model (IHSDM)...