In Noticias

El estudio NCHRP Research Results Digest 318: An Expert System for Recommending Speed Limits in Speed Zones (2006) resulted in the deployment of the USLIMITS2 sentó las bases de las limitaciones de velocidad en EEUU. Las cambiantes condiciones del trafico en la última década han hecho necesario revisar dichos límites para lo que se lanza una convocatoria de I+D destinada a revisar los algoritmos sobre los que se basan los límites de velocidad en vigor.

BACKGROUND

NCHRP Research Results Digest 318: An Expert System for Recommending Speed Limits in Speed Zones (2006) resulted in the deployment of the USLIMITS2. USLIMITS2, hosted by the Federal Highway Administration, employs a decision algorithm to advise the user of the recommended speed limit for the specific road section of interest. The existing algorithm focuses primarily on operating speeds (85th percentile speed, 50th percentile speed) and other variables entered by the user to determine the recommended speed limit. USLIMITS2 was updated in early 2018 to improve usability, but the decision algorithm has not been updated since 2006. New research should refine the decision rules of the algorithm and develop the next generation of USLIMITS2.

OBJECTIVES

The objectives of this research are to (1) determine what updates are needed for the USLIMITS2 decision algorithm to establish safe, credible, and enforceable speed limits for a variety of facility types and contexts, including high, moderate, and low speed facilities that serve all roadway users; (2) update the algorithm and conduct user testing; (3) identify and incorporate potential enhancements that will increase the user base; and (4) develop an implementation and training plan.

RESEARCH PLAN

The NCHRP is seeking the insights of proposers on how best to achieve the research objectives. Proposers are expected to describe research plans that can realistically be accomplished within the constraints of available funds and contract time. Proposals must present the proposers’ current thinking in sufficient detail to demonstrate their understanding of the issues and the soundness of their approach to meeting the research objective.

The research plan should (1) include a kick-off teleconference with the research team and NCHRP, convened within 1 month of the contract’s execution; (2) address how the proposer intends to satisfy the project objective; (3) be divided logically into detailed tasks that are necessary to fulfill the research objectives and include appropriate milestones and interim deliverables; and (4) incorporate opportunities for the project panel to review, comment on, and approve milestone deliverables.

Accomplishment of the project objective(s) will require at least the following tasks.

TASKS

Task descriptions are intended to provide a framework for conducting the research. The NCHRP is seeking the insights of proposers on how best to achieve the research objective. Proposers are expected to describe research plans that can realistically be accomplished within the constraints of available funds and contract time. Proposals must present the proposers’ current thinking in sufficient detail to demonstrate their understanding of the issues and the soundness of their approach to meeting the research objective.

Para más información, acceda a: https://apps.trb.org/cmsfeed/TRBNetProjectDisplay.asp?ProjectID=4736

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