CAJ | 학술논문

针对高速公路路段是否包含出入口匝道的特征，提出了1种行程时间估计改进方法。根据不同类型路段流量变化及影响范围，通过匝道物理位置对传统半距离法中路段行程时间的取值进行优化，获得了适应于匝道引起流量不均衡的行程时间估计方法。以南京机场高速公路为背景，通过Vissim仿真所得地点速度值，结合路段行程时间真实值，检验所提方法的性能。实验结果表明：当路段出入匝道的流量均衡时，所提方法较半距离法的精度提高3．71％，较空间线性插值法精度提高4.59％，当出入匝道的流量相差较大时，所提方法较半距离法的精度提高16．27％，较空间线性插值法精度提高17．29％。结果验证了改进方法较半距离法和空间线性插值法更具优越性。
침대고속공로로단시부포함출입구잡도적특정，제출료1충행정시간고계개진방법。근거불동류형로단류량변화급영향범위，통과잡도물리위치대전통반거리법중로단행정시간적취치진행우화，획득료괄응우잡도인기류량불균형적행정시간고계방법。이남경궤장고속공로위배경，통과Vissim방진소득지점속도치，결합로단행정시간진실치，검험소제방법적성능。실험결과표명：당로단출입잡도적류량균형시，소제방법교반거리법적정도제고3．71％，교공간선성삽치법정도제고4.59％，당출입잡도적류량상차교대시，소제방법교반거리법적정도제고16．27％，교공간선성삽치법정도제고17．29％。결과험증료개진방법교반거리법화공간선성삽치법경구우월성。
An improved method of travel time estimation on a freeway with focusing on the freeway section charac‐teristics is proposed .In consideration of traffic flow fluctuation and influence areas on different sections ,the proposed method optimizes the estimates of the travel time on freeway sections based on the locations of ramps on the link and it is applicable for the freeway sections with ramps which cause an uneven traffic flow .The proposed method was tested on Nanjing Airport Highway as a case study by simulated speed from Vissim and the actual travel time .The results show that the accuracy of travel time estimates could increase 3 .71% and 4 .59% comparing to the estimates by semi‐distance method and space linear interpolation method respectively when the traffic flow rates of ramps were balanced ;the accura‐cy of travel time estimates could increase 16 .27% and 17 .29% respectively when the traffic flow rates on ramps were sig‐nificant different .The results confirmed that the proposed method could provide more accurate travel time estimates on freeways .