Abstract
O processo de definição da velocidade limite em rodovias envolve uma série de fatores, não claramente definidos em termos de uma ordem de relevância que possibilite o especialista – responsável por tomar decisão – optar pela melhor escolha. Como o estabelecimento de um limite de velocidade se caracteriza pela subjetividade, sendo um processo regido pela incerteza e pela imprecisão, a lógica fuzzy mostra-se como alternativa para a solução deste problema. Assim, especialistas da área foram questionados quanto à influência de fatores pré-determinados na velocidade limite de rodovias e, em seguida, foi aplicado um método fuzzy multicritério, otimizado por meio de um algoritmo genético, para que as variáveis fossem hierarquizadas em termos de pesos e, consequentemente, relevância. O método convergiu a resultados satisfatórios, possibilitando não somente a concepção de um sistema especialista para o estabelecimento de velocidades limites, mas também aplicações em outras áreas.
Highlights
The settlement of a speed limit in a roadway segment is an effort of great importance for traf ic low
This study aims to rank the variables that in luence the process of choosing a speed limit, with the application of a fuzzy multicriteria decision-making method, that was capable of providing weights to these variables
Crash data was considered as a high relevance factor, since crashes have a strong relationship with speed and, with speed limits
Summary
The settlement of a speed limit in a roadway segment is an effort of great importance for traf ic low. The proper de inition of a speed limit represents a meaningful role in terms of assuring better luidity, and minimizing crash risk, and it is a hard task to ind a balance between these goals (Correia and Silva, 2011). The dif iculty focuses on inding a consistent speed limit, encompassing many relevant questions to road users, including drivers, pedestrians and cyclists. Brazilian highways are conceived to meet a speci ic design speed, according to a technical classi ication (and, to a traf ic volume), given a terrain classi ication (DNER, 1999). The disordered growth of urban centers allowed, in many cases, roadside occupation, resulting in conditions not originally foreseen by the Manual of Geometric Design of Rural Highways (DNER, 1999), such as pedestrians and intersections.
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