Global path preference and local response: A reward decomposition approach for network path choice analysis in the presence of locally perceived attributes

TL;DR

This paper introduces a reward decomposition model for analyzing how travelers make path choices based on globally perceived attributes and locally perceived attributes, demonstrated through pedestrian behavior in an urban network.

Contribution

It proposes a novel reward decomposition approach integrated into a recursive path choice model, enabling analysis of local versus global attribute influence on path decisions.

Findings

Pedestrians react more to local visual street quality than global perception.

The model can be estimated from observed paths without requiring pre-planned route information.

Location-specific interventions are crucial when attributes are only locally perceived.

Abstract

This study performs an attribute-level analysis of the global and local path preferences of network travelers. To this end, a reward decomposition approach is proposed and integrated into a link-based recursive (Markovian) path choice model. The approach decomposes the instantaneous reward function associated with each state-action pair into the global utility, a function of attributes globally perceived from anywhere in the network, and the local utility, a function of attributes that are only locally perceived from the current state. Only the global utility then enters the value function of each state, representing the future expected utility toward the destination. This global-local path choice model with decomposed reward functions allows us to analyze to what extent and which attributes affect the global and local path choices of agents. Moreover, unlike most adaptive path choice models, the proposed model can be estimated based on revealed path observations (without the information of plans) and as efficiently as deterministic recursive path choice models. The model was applied to the real pedestrian path choice observations in an urban street network where the green view index was extracted as a visual street quality from Google Street View images. The result revealed that pedestrians locally perceive and react to the visual street quality, rather than they have the pre-trip global perception on it. Furthermore, the simulation results using the estimated models suggested the importance of location selection of interventions when policy-related attributes are only locally perceived by travelers.