ITS Berkeley

Travel Distance Through Transportation Terminals on a Grid: Alternative Routing Strategies

Hall, R.W.
Daganzo, C. F.
1984

This paper analyzes two strategies for routing shipments through transportation terminals. One strategy is to send each shipment through the terminal offering the minimum possible travel distance. The other strategy is to send each shipment through the terminal near the travel origin offering the minimum possible travel distance. Although the second strategy results in slightly larger average travel distance, more flow is consolidate onto transportation links. Flow consolidation is desirable because of economies to scale in transportation. The relation between average travel distance...

The Role of Break Bulk Terminals in Many to Many Logistic Networks

Daganzo, Carlos F.
1984

Optimal Strategies for Distributing Non Storable Items Without Transhipments

Han, A.F.
Daganzo, C. F.
1984

Design of Multiple Vehicle Delivery Tours

Newell, G. F.
Daganzo, Carlos F.
1984

Checkpoint Dial-a-Ride Systems

Daganzo, Carlos F.
1984

This paper presents a preliminary study of the feasibility of checkpoint dial-a-ride systems. Their cost-effectiveness is compared to that of fixed route systems with no transfers and door-to-door dial-a-ride systems. The results are derived for a simple routing strategy, and involve some simplifications which facilitate the comparisons. For high demand levels, the total cost per passenger for fixed route and checkpoint systems is very close. In fact, their optimal configurations are so alike, and the occurrence of route deviations is so rare, that fixed route systems should be preferred,...

The Distance Traveled to Visit N Points with a Maximum of C Stops per Vehicle: An Analytic Model and an Application

Daganzo, Carlos F.
1984

The purpose of this paper is to develop a simple formula to predict the distance traveled by fleets of vehicles in physical distribution problems involving a depot and its area of influence. Since the transportation cost of operating a break-bulk terminal (or a warehouse) is intimately related to the distance traveled, the availability of such a simple formula should facilitate the study of more complex logistics problems. A simple manual dispatching strategy intended to mimic what dispatchers do, but simple enough to admit analytical modeling is presented. Since the formulas agree rather...

Vehicle-Miles for a Freight Carrier With Two Capacity Constraints

Hall, Randolf W.
Daganzo, Carlos F.
1985

The amount of freight that can be fit on a vehicle depends on the vehicle's weight capacity and volume capacity. In this paper mathematical equations are developed for evaluating the impact of weight capacity and volume capacity on total vehicle-miles. It is shown that the number of vehicle loads needed to carry a large amount of material is minimized when all vehicles are filled to the same capacity constraint. This is accomplished by mixing light items with heavy items in vehicle loads. Following this policy can reduce the number of vehicle loads and vehicle-miles. Under ideal...

The Uniqueness of a Time-dependent Equilibrium Distribution of Arrivals at a Single Bottleneck

Daganzo, Carlos F.
1985

Motorists going through a bottleneck during the morning rush hour have to time their departure times to ensure they arrive to work at a reasonable time. Traffic and congestion levels at the bottleneck depend on the motorists' work schedule and the disutility of unpunctuality. This paper shows that, under certain conditions, there is only one equilibrium order of arrivals; an order under which motorists do not have an incentive to jockey for position in the queue.

Distribution of Perishable items : Transhipments Allowed

Han, A.F.
Daganzo, C.
1985

Distribution Strategies that Minimize Transportation and Inventory Costs

Burns, Lawrence D.
Hall, Randolph W.
Blumenfeld, Dennis E.
Daganzo, Carlos F.
1985

This paper develops an analytic method for minimizing the cost of distributing freight by truck from a supplier to many customers. It derives formulas for transportation and inventory costs, and determines the optimal trade-off between these costs. The paper analyzes and compares two distribution strategies: direct shipping (i.e., shipping separate loads to each customer) and peddling (i.e., dispatching trucks that deliver items to more than one customer per load). The cost trade-off in each strategy depends on shipment size. Our results indicate that, for direct shipping, the optimal...