ITS Berkeley

The Design of a New Freight Distribution System in Venice

Baita, Flavio
Daganzo, Carlos F.
Ukovich, Walter
2025

This paper examines the reorganization of freight transportation in the city of Venice, Italy. Most of the freight arrives from the mainland by trucks, but must be carried to the final customers by boats, through a network of small canals. The existence of constraints, related to the widths and clearances of the canals, makes it necessary to use boats of different sizes and capacities. In this paper, we analyze the transshipment operations from trucks to boats, and the organization of the boat distribution.

Public Transportation Systems: Principles of System Design, Operations Planning and Real-Time Control

Daganzo, Carlos F.
Ouyang, Yanfeng
2019

This unique book explains how to think systematically about public transportation through the lens of physics models. The book includes aspects of system design, resource management, operations and control. It presents both, basic theories that reveal fundamental issues, and practical recipes that can be readily used for real-world applications. The principles conveyed in this book cover not only traditional transit modes such as subways, buses and taxis but also the newer mobility services that are being enabled by advances in telematics and robotics.

Coordinated Vehicle Routing with Uncertain Demand

Daganzo, Carlos F.
Erera, Alan L.
2000

Numerical optimization methods have been developed and applied successfully to many deterministic variants of the so-called vehicle routing problem (VRP). Unfortunately, existing numerical methodologies are not as effective for planning and design problems when uncertainty is a significant issue. In view of this, this presentation will show how approximation models for large-scale uncertain VRP's can complement conventional optimization methods and allow for the exploration of a broader set of design and operating strategies than is currently possible. The presentation will consider...

Probabilistic Structure of Two-Lane Road Traffic

Daganzo, Carlos F.
1975

In most predictive models for two-lane road traffic, it is assumed that platoons have no physical dimensions, thus restricting their applicability to light traffic where a platoon cannot be long enough to block the progression of the next one. In this paper a model that can be used for heavy traffic is presented. A queueing theory approach in which vehicles are allowed to have physical dimensions yields the platoon length distribution, the delays to fast vehicles, the headway process and the flow density diagram for both the space and time processes. Unlike in other models, the passing...

Traffic Delay at Unsignalized Intersections: Clarification of Some Issues

Daganzo, Carlos F.
1977

Investigations in this area have been directed at finding the delay to a motorist who arrives at an intersection and wishes to cross a high-priority traffic stream. In this paper two conceptual errors that have appeared in some past publications are identified and corrected.

On Stochastic Models of Traffic Assignment

Daganzo, Carlos F.
Sheffi, Yosef
1977

This paper contains a quantitative evaluation of probabilistic traffic assignment models and proposes an alternate formulation. First, the concept of stochastic-user-equilibration (S-U-E) is formalized as an extension of Wardrop's user-equilibration criterion. Then, the stochastic-network-loading (S-N-L) problem (a special case of S-U-E for networks with constant link costs) is analyzed in detail and an expression for the probability of route choice which is based on two general postulates of user behavior is derived. The paper also discusses the weaknesses of existing S-N-L techniques...

Multinomial Probit and Qualitative Choice: A Computationally Efficient Algorithm

Daganzo, Carlos F.
Bouthelier, Fernando
Sheffi, Yosef
1977

Even though multinomial probit models have many attractive theoretical features and have been proposed for diverse choice problems (such as modal split and route choice in the transportation field), they have never been used in practice due to the lack of an adequate numerical technique for their application. The purpose of this paper is to introduce such a technique and to demonstrate the feasibility of forecasting with multinominal probit models. Our limited computational experience with the proposed numerical technique indicates that it is accurate, and can be efficiently applied to...

On the Traffic Assignment Problem with Flow Dependent Costs—I

Daganzo, Carlos F.
1977

In a recent paper LeBlanc et al. presented an efficient mathematical algorithm to solve the multicommodity user-equilibrated network flow distribution problem with flow dependent costs. This paper shows how to generalize the algorithm to networks with link capacities and illustrates the modification with a simple numerical example.

On the Traffic Assignment Problem with Flow Dependent Costs—II

Daganzo, Carlos F.
1977

This note generalizes the results obtained by Daganzo (1977) in a previous paper by showing how to incorporate link capacities into any equilibrium traffic assignment algorithm. This is done by defining an equivalent uncapacitated traffic equilibrium problem (EP). As an example it is shown how Nguyen's algorithm (Nguyen, 1974) can be easily modified to deal with capacitated networks.

Some Statistical Problems in Connection with Traffic Assignment

Daganzo, Carlos F.
1977

This paper gives the approximation joint probability distribution function of the link traffic flows on a network. The knowledge of such distribution enables us to derive the log-likehood function for the estimation (with link data) of the traffic diversion parameter, Ф, that appears in most stochastic assignment models. It also enables us to perform goodness to fit statistical tests for the validation of traffic assignment methods. Both of these procedures are illustrated with a small numerical example. It is also pointed out that it is possible to calibrate and/or validate a traffic...