Planning-Level Guidelines for Modern Roundabouts, 2008

This technical memorandum provides preliminary planning-level guidance to engineers, technicians, planners, and policymakers who may be considering a modern roundabout at an existing or proposed intersection in Iowa.

Guidelines for Perinatal Services, Eight Edition, 2008

This document represents the Eighth Edition of what formerly was called Standards for Perinatal Centers. Since then, the name has changed to Guidelines for Perinatal Services, because use of the term “standards” connotes an inflexibility of application that is not intended. As noted in the preface to an earlier edition, so-called standards that apply to major urban areas are not always practical in rural America. Unfortunately, when a bad outcome occurs and litigation ensues, the differences between urban and rural are frequently ignored. These guidelines are not meant to hold Iowa hospitals and Iowa perinatal professionals to an impractical ideal.

Guidelines for the Inclusion of Left-Turn Lanes at Rural Highway Intersections, HR-147, 1970

Provision of left turn lanes is a major problem which lacks an objective approach. Various techniques and procedures in use have been reviewed. Traffic characteristics at typical Iowa intersections have been measured. A rational approach for inclusion of a left turn lane has been developed, based on relating the benefits to the road user to the cost of providing the added turing lane. An analysis of field data gathered under this project indicates that the use of theoretical distribution to describe vehicle headways is not applicable to rural Iowa two lane roads. As an alternate approach the mass of field data gathered were examined using multiple regression techniques to yield equations for predicting stops and delays. The benefit-cost ratio technique is recommended as the criterion for decision making.

Quantitative Guidelines for Thin Maintenance Surfaces, TR-435, 2003

What follows are the refined guidelines from the Thin Maintenance Surface: Phase II Report. For that report, test sections were created and monitored along with some existing test sections. From the monitoring and evaluation of these test sections, literature reviews, and the experience and knowledge of the authors, the following guidelines were created. More information about thin maintenance surfaces and their uses can be found in the above-mentioned report.