The results of the optimization – the different solution types
| Solution | |||
|---|---|---|---|
| Do-nothing | Random | Optimal | |
| Fleet size – total number of vehicles | 50 | 57 | 68 |
| Including company's “own” (currently exploited) | |||
| Tractor with semitrailer curtain sided 20t | 3 | 3 | 1 |
| Tractor with semitrailer curtain sided 24t | 15 | 6 | 12 |
| Tractor with semitrailer curtain sided 26t | 7 | 5 | 7 |
| Truck closed 6t | 2 | 2 | 0 |
| Truck full tilt 8t | 7 | 4 | 0 |
| Truck full tilt 10t | 2 | 1 | 2 |
| Truck insulated 8t | 3 | 3 | 0 |
| Truck insulated 14t | 4 | 1 | 0 |
| Truck refrigerated 16t | 2 | 0 | 2 |
| Van closed 1.5t | 2 | 2 | 1 |
| Van closed 2t | 2 | 1 | 0 |
| Van insulated 2t | 1 | 1 | 0 |
| Including “new” vehicles | |||
| Truck with tandem trailer full tilt 28t (outright purchase) | – | 4 | 0 |
| Truck with tandem trailer full tilt 28t (leasing | – | 4 | 0 |
| Tractor with semitrailer curtain sided 20t (outright purchase) | – | 1 | 0 |
| Tractor with semitrailer curtain sided 20t (leasing) | – | 1 | 0 |
| Tractor with semitrailer curtain sided 24t (outright purchase) | – | 2 | 0 |
| Tractor with semitrailer curtain sided 24t (leasing) | – | 6 | 0 |
| Truck full tilt 14t (outright purchase) | – | 2 | 9 |
| Truck full tilt 14t (leasing) | – | 5 | 34 |
| Truck insulated 12t (outright purchase) | – | 2 | 0 |
| Truck insulated 12t (leasing) | – | 1 | 0 |
| Number of O/N vehicles in the fleet | 50/0 | 29/28 | 25/43 |
| Average values of ST/AT decision variables, in months | –/– | 20/20 | 2/6 |
| Age – average within the decision planning horizon, in years | 8.4 | 7.1 | 7.3 |
| Age – at the moment of acquisition in years (average / min / max) | –/–/– | 4/0/19 | 5/0/12 |
| Vehicles versatility – ability to serve particular demand types | 45% | 47% | 59% |
| Average vehicles utilization index | 98% | 96% | 90% |
| Make-or-buy (% of total kilometers = % of total demand) option make | 67% | 75% | 83% |
| option buy | 33% | 25% | 17% |
| Costs* | |||
| Total discounted (within the decision planning horizon) | |||
| In total | 100% | 98% | 89% |
| Company's “own” vehicles (the make option) | 100% | 115% | 116% |
| Outside vehicles (the buy option) | 100% | 75% | 51% |
| Unit discounted | |||
| In total | 100% | 98% | 89% |
| Company's “own” vehicles (the make option) | 100% | 104% | 95% |
| Outside vehicles (the buy option) | 100% | 96% | 94% |
| Solution | |||
|---|---|---|---|
| Do-nothing | Random | Optimal | |
| Fleet size – total number of vehicles | 50 | 57 | 68 |
| Tractor with semitrailer curtain sided 20 | 3 | 3 | 1 |
| Tractor with semitrailer curtain sided 24 | 15 | 6 | 12 |
| Tractor with semitrailer curtain sided 26 | 7 | 5 | 7 |
| Truck closed 6 | 2 | 2 | 0 |
| Truck full tilt 8 | 7 | 4 | 0 |
| Truck full tilt 10 | 2 | 1 | 2 |
| Truck insulated 8 | 3 | 3 | 0 |
| Truck insulated 14 | 4 | 1 | 0 |
| Truck refrigerated 16 | 2 | 0 | 2 |
| Van closed 1.5 | 2 | 2 | 1 |
| Van closed 2 | 2 | 1 | 0 |
| Van insulated 2 | 1 | 1 | 0 |
| Truck with tandem trailer full tilt 28 | – | 4 | 0 |
| Truck with tandem trailer full tilt 28 | – | 4 | 0 |
| Tractor with semitrailer curtain sided 20 | – | 1 | 0 |
| Tractor with semitrailer curtain sided 20 | – | 1 | 0 |
| Tractor with semitrailer curtain sided 24 | – | 2 | 0 |
| Tractor with semitrailer curtain sided 24 | – | 6 | 0 |
| Truck full tilt 14 | – | 2 | 9 |
| Truck full tilt 14 | – | 5 | 34 |
| Truck insulated 12 | – | 2 | 0 |
| Truck insulated 12 | – | 1 | 0 |
| Number of | 50/0 | 29/28 | 25/43 |
| Average values of ST/AT decision variables, in months | –/– | 20/20 | 2/6 |
| Age – average within the decision planning horizon, in years | 8.4 | 7.1 | 7.3 |
| Age – at the moment of acquisition in years (average / min / max) | –/–/– | 4/0/19 | 5/0/12 |
| Vehicles versatility – ability to serve particular demand types | 45% | 47% | 59% |
| Average vehicles utilization index | 98% | 96% | 90% |
| Make-or-buy (% of total kilometers = % of total demand) option make | 67% | 75% | 83% |
| option buy | 33% | 25% | 17% |
| Costs* | |||
| In total | 100% | 98% | 89% |
| Company's “own” vehicles (the make option) | 100% | 115% | 116% |
| Outside vehicles (the buy option) | 100% | 75% | 51% |
| In total | 100% | 98% | 89% |
| Company's “own” vehicles (the make option) | 100% | 104% | 95% |
| Outside vehicles (the buy option) | 100% | 96% | 94% |
Note(s): *In comparison to the do-nothing option
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