Transportation data availability and model methodology research will constrain the progress of these improvements, however.

交通数据来源和模型方法研究是制约模型改进进程的主要因素。

youdao

For new urban distracts, the traditional 4-phase transportation demand forecasting model can not be used, because of the lack of the trip production and distribution phase data.

对于规划新城区，传统的四阶段交通需求预测方法难以使用，因为交通生成和分布预测所必需的条件无法满足。

youdao

For new urban distracts, the traditional 4-phase transportation demand forecasting model can not be used, because of the lack of the trip production and distribution phase data.

对于规划新城区，传统的四阶段交通需求预测方法难以使用，因为交通生成和分布预测所必需的条件无法满足。

youdao