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PAVED SHOULDERS ON PRIMARY HIGHWAYS IN IOWA: AN ANALYSIS OF SHOULDER SURFACING CRITERIA, COSTS, AND BENEFITS.
| 题名： | PAVED SHOULDERS ON PRIMARY HIGHWAYS IN IOWA: AN ANALYSIS OF SHOULDER SURFACING CRITERIA, COSTS, AND BENEFITS. |
| 作者： | Souleyrette-R; McDonald-T; Hans-Z; Kamyab-A; Welch-T; Storm-B |
| 关键词： | Benefits-; Budgeting-; Costs-; Cyclists-; Expressways-; Freeways-; Highway-capacity; Highway-design; Highway-safety; Impacts-; Iowa-; Maintenance-; Paved-shoulders; Pavement-performance; Policy-; Primary-highways; Strategic-planning; Surface-course-Pavements; Surfacing-; Traffic-accidents; Width- |
| 摘要： | The value of providing paved shoulders adjacent to many higher volume roadways has been accepted in many states across the country. Iowa's paved shoulder policy is considerably more conservative than neighboring states, particularly on rural four-lane and high-volume two-lane highways. The objectives of this research are to examine current design criteria for shoulders employed in Iowa and surrounding states, compare benefits and costs of alternative surface types and widths, and make recommendations based on this analysis for consideration in future design policies for primary highways in Iowa. The report finds that many safety and maintenance benefits would result from enhancing Iowa's paved shoulder and rumble strip design practices for freeways, expressways, and Super 2 highway corridors. The benefits of paved shoulders include reduced numbers of certain crashes, higher capacity potentials, reduced maintenance, enhanced opportunities for other users such as bicyclists, and even possibly increased longevity of pavements. Alternative paved shoulder policies and programming strategies are also offered, with detailed assessments of the benefits, costs, and budget impacts. |
| 总页数： | 2001/11. pp54 (1 Fig., Tabs., Refs., 2 App.) |
| 报告类型： | 科技报告 |
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