Research Article

Mathematical Formulation and Comparison of Solution Approaches for the Vehicle Routing Problem with Access Time Windows

Table 1

Results obtained from the application of the different solution methodologies to 60 problem instances of the case study. For each case, the total route length (Fitness), measured in km, and the number of vehicles required (No. V) are shown.

Problem instanceNo. CRZCTWGA + LocalSTABU + LocalSC & WEXACT
FitnessNo. VFitnessNo. VFitnessNo. VFitnessNo. V

11000112.021112.021112.021112.021
21.12112.021112.311112.311112.021
34112.311112.591113.351112.311
46113.921114.681114.951113.921
51.62112.021112.021112.021112.021
64112.711112.591113.841112.591
76142.741142.821142.742142.741
822112.021112.021112.021112.021
94123.841123.071123.071122.901
106171.162171.181190.722171.162

111500140.911141.511141.511--
121.12141.511141.601141.901--
134141.091142.161143.211--
146145.301145.621145.381--
151.62141.511142.811145.381--
164143.231144.261160.592--
176178.282191.102194.502--
1822140.911141.091142.841--
194146.601146.601161.692--
206285.302286.312288.832--

212500258.412259.222262.432--
221.12261.132260.242266.932--
234262.432261.092267.202--
246262.112271.472270.222--
251.62262.272261.402261.762--
264264.092262.302269.332--
276296.742279.923291.023--
2822262.342267.232266.132--
294265.752264.372263.532--
306349.203348.613355.373--

315000431.883437.663440.173--
321.12436.193439.333441.173--
334440.113443.673440.003--
346456.313460.354466.034--
351.62434.243450.763458.134--
364455.524442.823441.763--
376493.284487.214505.974--
3822434.923460.914441.563--
394462.904447.953456.844--
406582.304582.544529.315--

4110000815.266815.866824.806--
421.12816.617819.856831.226--
434829.605822.496826.206--
446880.406819.316825.636--
451.62818.877819.316830.436--
464825.675820.916846.216--
476867.607883.497871.026--
4822848.016836.336835.896--
494837.736826.646829.886--
506849.747898.837904.077--

51150001182.8491178.5581182.328--
521.121205.0681187.2881201.288--
5341215.4691195.8281192.618--
5461194.1581196.7481205.909--
551.621175.6481187.1481188.038--
5641200.3391210.4191212.689--
5761235.7191242.3891247.609--
58221218.4691241.4391233.539--
5941238.0791270.7691219.469--
6061247.4791280.62101302.5010--