The results of this research indicate that the volume of passenger
cars and light non-passenger car vehicles plays a significant role in
the likelihood of no injury accidents, but the volume of heavy
vehicles does not have much effect on the likelihood of no injury
accidents on urban highways. The volume of light non-passenger car
vehicles increases the likelihood of more severe accidents, but the
volume of passenger cars and heavy vehicles do not have much
influence on the likelihood of more severe accidents. Therefore, it is
concluded that light non-passenger car vehicles, including taxis and
motorcycles, play a considerable part in the occurrence of accidents
on urban highways, including both no injury and more severe
accidents, but heavy vehicles do not. These conclusions will be
helpful for future projects involving the management of traffic on
urban highways. In these projects, planning to control the role of
taxis and motorcycles in accident occurrence should be adopted.
This could include the separation of these vehicles types from
normal flow on urban highways. The results also indicate that the
negative binomial regression model is a valid and efficient model for
modeling and predicting the accidents on urban highways. The study
had some limitations, two of which are related to the research data,
as mentioned in Section 4: the volume data for each kind of vehicle
were not readily available, and the models did not consider the
seasonal changes of traffic because the statistics for traffic volume in
different seasons were not available. The other limitation of the
research is related to the models used for modeling accidents.
Poisson and NB regression models have their own limitations
The results of this research indicate that the volume of passengercars and light non-passenger car vehicles plays a significant role inthe likelihood of no injury accidents, but the volume of heavyvehicles does not have much effect on the likelihood of no injuryaccidents on urban highways. The volume of light non-passenger carvehicles increases the likelihood of more severe accidents, but thevolume of passenger cars and heavy vehicles do not have muchinfluence on the likelihood of more severe accidents. Therefore, it isconcluded that light non-passenger car vehicles, including taxis andmotorcycles, play a considerable part in the occurrence of accidentson urban highways, including both no injury and more severeaccidents, but heavy vehicles do not. These conclusions will behelpful for future projects involving the management of traffic onurban highways. In these projects, planning to control the role oftaxis and motorcycles in accident occurrence should be adopted.This could include the separation of these vehicles types fromnormal flow on urban highways. The results also indicate that thenegative binomial regression model is a valid and efficient model formodeling and predicting the accidents on urban highways. The studyhad some limitations, two of which are related to the research data,as mentioned in Section 4: the volume data for each kind of vehiclewere not readily available, and the models did not consider theseasonal changes of traffic because the statistics for traffic volume in
different seasons were not available. The other limitation of the
research is related to the models used for modeling accidents.
Poisson and NB regression models have their own limitations
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