Adaptação do HCM-2000 para determinação do nível de serviço em rodovias de pista simples sem faixas adicionais no Brasil / Adaptation of the HCM-2000 to estimate the level of service for two-lane highways without auxiliary lanes Brazil

AUTOR(ES)

Cintia Yumiko Egami

DATA DE PUBLICAÇÃO

2006

RESUMO

This thesis objective is to adapt the Highway Manual Capacity 2000, procedures to produce better estimates of service level and capacity for two-lane highways studied, In order to do this, an automatic calibration system, implementing a genetic algorithm and coded in Perl, was used to obtain a recalibrated version of TRARR, a two-lane highway simulation model. The calibration, that which uses speed and percent vehicles traveling in platoons data collected by videotaping, was carried out simultaneously for five different road segments, so that the recalibrated model would be able to reproduce traffic behavior on a typical two-lane road in the state of São Paulo, Brazil. The recalibrated model was validated using a second, independent, set of data. Based on the assumption that the general framework of the methodology should be kept, the adaptation was achieved by obtaining new values for the adjustment factors used in the procedure. Thus, the simulation experiments used in the development of HCM-2000 methodology were reproduced using the recalibrated TRARR model. The following adjustment factors were adapted: peak hour factor (PHF), grade adjustment factor (fG), heavy vehicle equivalence factor (ET), adjustment factor for the effect of non-passing zones (fnp) and adjustment factor for combined effect of directional distribution of traffic and percentage of no-passing zones (fd/np). With the exception of the PHF, all factors were obtained from simulation results. In order to assess the accuracy of the proposed adaptation observed levels of service were compared to the estimates obtained through the original HCM-2000 procedure and the modified procedure. The results of these comparisons clearly show that the estimates obtained using the proposed values for the adjustment factors are closer to the observed levels of service than the estimates obtained using the original values for the adjustment factors.

ASSUNTO(S)

algoritmo genético calibração e validação calibration and validation genetic algorithms hcm-2000 hcm-2000 level of service nível de serviço rodovias de pista simples simulação de tráfego traffic simulation two-lane highways

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