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arxiv: 2505.12145 · v2 · pith:5VV5NY7Hnew · submitted 2025-05-17 · 💻 cs.SI

Trajectory-Integrated Accessibility Analysis of Public Electric Vehicle Charging Stations

Pith reviewed 2026-05-22 14:12 UTC · model grok-4.3

classification 💻 cs.SI
keywords electric vehicle chargingaccessibility metricsmobility trajectoriesspatial disparitiesracial disparitiesSan Francisco Bay Areapublic infrastructureEV adoption
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The pith

Bay Area residents have on average 7.5 hours daily when their locations fall within 1 km of a public Level 2 EV charger.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

This paper develops a metric that tracks public EV charger access along people's full daily travel paths instead of only at home. It applies the approach to one week of detailed location records covering millions of San Francisco Bay Area residents and finds average daily access windows of 7.5 hours for slower Level 2 chargers and 5.2 hours for fast DC chargers. The study shows access has risen steadily over the past decade yet still varies sharply by neighborhood and by racial group, with gaps driven by both charger placement and differing movement patterns.

Core claim

The central claim is that integrating full individual trajectories with charger locations produces a more accurate accessibility measure than residential-only methods; under the June 2024 network, Bay Area residents experience 7.5 hours and 5.2 hours per day of proximity to public L2 and DCFC ports respectively, with access rising over ten years but marked by Gini indices of 0.38 (L2) and 0.44 (DCFC) across tracts and additional racial differences tied to mobility.

What carries the argument

The Trajectory-Integrated Public EVCS Accessibility (TI-acs) metric, which accumulates time intervals when an individual's recorded stay points lie within 1 km walking distance of a public charging port.

If this is right

  • The metric captures charging opportunities that occur near workplaces and during grid off-peak hours rather than only at residences.
  • Accessibility has grown steadily over the past decade as both the EV fleet and charger network expanded.
  • Spatial inequality remains high, quantified by Gini coefficients of 0.38 for Level 2 and 0.44 for DC fast chargers across census tracts.
  • Racial differences in access stem from both uneven charger density near homes and systematic differences in daily travel routes.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • City planners could prioritize charger siting along high-volume corridors that currently show low TI-acs values.
  • The same trajectory-integration method could be applied in other large metro areas that possess comparable mobile-device or GPS datasets.
  • Equity policies might need to address mobility-pattern differences in addition to simply adding chargers in residential zones.
  • Future versions of the metric could incorporate real-time charger occupancy or pricing to refine the effective access window.

Load-bearing premise

The one-week trajectory sample from the data providers represents typical long-term movement patterns for the entire six-million-resident population.

What would settle it

Re-running the calculation on a second independent week of trajectory data or on a larger resident sample and obtaining average daily access times differing by more than roughly one hour would undermine the reported averages.

Figures

Figures reproduced from arXiv: 2505.12145 by Jiaman Wu, Jinhua Zhao, Lunlong Li, Marta C. Gonz\'alez, Scott J. Moura, Yi Ju, Zhihan Su.

Figure 1
Figure 1. Figure 1: Graphic overview of the work. a Our research (top) integrates two data layers: one (bottom) is the geographical distribution of public charging resources, the other (middle) is week-long individual trajectories. b An illustrative example of TI-acs calculation. c Workflow of processing data, calculating TI-acs, and analyzing aggregated TI-acs. Yellow boxes are data types, with gray text below them annotatin… view at source ↗
Figure 2
Figure 2. Figure 2: Average TI-acs (within 1 km) across Bay area census tracts. a,b plot the census-tract-level averaged TI-acs to L2 and DCFC public chargers as of June 2024, respectively. Each census tract is colored by the average trajectory￾integrated accessible hours (TI-acs) of individuals whose home location is within the area. Means, Medians and 1/4, 3/4-quantiles of census-tract-level statistics are annotated. c, d c… view at source ↗
Figure 3
Figure 3. Figure 3: TI-acs breakdown. a,b plot the breakdown of TI-acs (accessible hours) into different stay location segments: home, work, other by different years from 2012 to 2024, for L2 and DCFC respectively. Height of bars represent the means of census-tract-averaged metric, and the darker error bars annotate quartiles (25%, 50%, 75%) of the metric (with 0 from the bottom of corresponding bars). Subplots (a1), (b1) are… view at source ↗
Figure 4
Figure 4. Figure 4: Racial disparities on TI-acs a, b plot the cumulative density function (CDF) of census-tract-level-averaged TI-acs (accessible hours) in year 2024 grouped by the dominate race (ethnic identity) of the census tracts, for public L2 and DCFC, respectively. Horizontal bars and markers at the top mark the quartiles (25%, 50%, 75%) of TI-acs for different groups, sharing the same x-axis with the main plots. Subp… view at source ↗
Figure 5
Figure 5. Figure 5: TI-acs [hours] breakdown by different distance thresholds Subplot titles specify the accessible radius. x-axis marks EVCS snapshots in different years. top row: L2, bottom row: DCFC. left half : breakdown by stay location types. right half : breakdown by time in the day. Please refer to Fig.3 for detailed legends. In this study, we adopt TI-acs [hours] (a.k.a. accessible hours) as the primary metric for tw… view at source ↗
Figure 6
Figure 6. Figure 6: Statistical test Racial disparities on TI-acs left: no income term, i.e., βr’s from regression yi “ ř r βrδir ` β0 ` ϵi. right: income (logarithm) term up to degree 4, i.e., βr’s from regression yi “ ř r βrδir ` ř4 k“1 β k I plog Ij q k ` β0 ` ϵi. Please refer to [PITH_FULL_IMAGE:figures/full_fig_p012_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: TI-acs [hours] map across Bay Area census tracts in multiple years [PITH_FULL_IMAGE:figures/full_fig_p018_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: TI-acs [ports] map across Bay Area census tracts in multiple years Appendix B: Preprocessing trajectories simulated by TimeGeo The mobility profile generated directly from original TimeGeo simulator consists of a list of stays represented as (time, type, lon, lat) for each individual. Here, time is an integer in the set 1, ..., 1008, indicating the time slot index for 10-minute intervals throughout the wee… view at source ↗
read the original abstract

Electric vehicle (EV) charging infrastructure is crucial for advancing EV adoption, managing charging loads, and ensuring equitable transportation electrification. However, there remains a notable gap in comprehensive accessibility metrics that integrate the mobility of the users. This study introduces a novel accessibility metric, termed Trajectory-Integrated Public EVCS Accessibility (TI-acs), and uses it to assess public electric vehicle charging station (EVCS) accessibility for approximately 6 million residents in the San Francisco Bay Area based on detailed individual trajectory data in one week. Unlike conventional home-based metrics, TI-acs incorporates the accessibility of EVCS along individuals' travel trajectories, bringing insights on more public charging contexts, including public charging near workplaces and charging during grid off-peak periods. As of June 2024, given the current public EVCS network, Bay Area residents have, on average, 7.5 hours and 5.2 hours of access per day during which their stay locations are within 1 km (i.e. 10-12 min walking) of a public L2 and DCFC charging port, respectively. Over the past decade, TI-acs has steadily increased from the rapid expansion of the EV market and charging infrastructure. However, spatial disparities remain significant, as reflected in Gini indices of 0.38 (L2) and 0.44 (DCFC) across census tracts. Additionally, our analysis reveals racial disparities in TI-acs, driven not only by variations in charging infrastructure near residential areas but also by differences in their mobility patterns.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 2 minor

Summary. The manuscript introduces the Trajectory-Integrated Public EVCS Accessibility (TI-acs) metric, which integrates individual travel trajectories with public EV charging station locations to measure accessibility beyond static home-based approaches. Applied to the San Francisco Bay Area using one week of detailed individual trajectory data, the study reports average daily access of 7.5 hours to Level 2 chargers and 5.2 hours to DC fast chargers within a 1 km threshold as of June 2024. It further documents steady increases in TI-acs over the past decade, spatial disparities via Gini indices of 0.38 (L2) and 0.44 (DCFC) across census tracts, and racial disparities driven by both infrastructure distribution and mobility patterns.

Significance. If the trajectory sample proves representative of Bay Area mobility patterns, the TI-acs metric offers a meaningful advance by capturing dynamic charging opportunities along daily paths and during off-peak periods, which static metrics miss. The reported quantitative averages, temporal trends, and disparity analyses could usefully inform infrastructure planning and equity assessments. The use of real trajectory data and the explicit contrast with home-based metrics are clear strengths.

major comments (2)
  1. [Abstract and Results] Abstract and Results section: The central claims of 7.5 hours (L2) and 5.2 hours (DCFC) average daily access for the full ~6 million residents are derived from one week of individual trajectory data. The manuscript provides no information on sample size, demographic or geographic representativeness, or validation against census mobility surveys, which directly undermines the population-level extrapolation.
  2. [Methods and Results] Methods and Results: The 1 km accessibility threshold is treated as given without sensitivity analysis or justification tied to actual walking behavior data; because the headline averages and Gini coefficients depend on this choice, the robustness of both the access-time and disparity findings requires explicit testing.
minor comments (2)
  1. [Methods] The mathematical definition of the TI-acs metric would be clearer if presented with an explicit equation or pseudocode in the Methods section rather than only in prose.
  2. [Figures] Figure captions and axis labels should explicitly state the time window (one week in June 2024) and the exact distance threshold used for all reported statistics.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their constructive and detailed comments on our manuscript. We address each major comment below and describe the revisions we plan to incorporate.

read point-by-point responses
  1. Referee: [Abstract and Results] Abstract and Results section: The central claims of 7.5 hours (L2) and 5.2 hours (DCFC) average daily access for the full ~6 million residents are derived from one week of individual trajectory data. The manuscript provides no information on sample size, demographic or geographic representativeness, or validation against census mobility surveys, which directly undermines the population-level extrapolation.

    Authors: We acknowledge that the current version of the manuscript does not include explicit details on the trajectory dataset's sample size, demographic or geographic representativeness, or direct validation against census mobility surveys. In the revised manuscript, we will add a new subsection in the Methods section that reports the number of individuals and trajectories in the one-week sample, describes the data provider and collection method, discusses coverage across Bay Area counties and demographic groups, and includes any available comparisons to census or travel survey benchmarks. This addition will better support the population-level claims while remaining faithful to the data actually used. revision: yes

  2. Referee: [Methods and Results] Methods and Results: The 1 km accessibility threshold is treated as given without sensitivity analysis or justification tied to actual walking behavior data; because the headline averages and Gini coefficients depend on this choice, the robustness of both the access-time and disparity findings requires explicit testing.

    Authors: We agree that the robustness of the headline results would be strengthened by explicit sensitivity testing. In the revised manuscript, we will add a sensitivity analysis subsection that recomputes the average access times and Gini coefficients for alternative thresholds (500 m and 1.5 km) and report how the key findings change. We will also expand the justification for the 1 km choice by referencing empirical studies on acceptable walking distances to public amenities, while retaining the parenthetical note on approximate walking time already present in the abstract. revision: yes

Circularity Check

0 steps flagged

No significant circularity; analysis is direct computation from external inputs

full rationale

The paper introduces the TI-acs metric as an explicit integration of time spent within 1 km of EVCS locations along observed trajectories, then computes population-level averages directly from one week of external trajectory data and June 2024 EVCS locations. No equations or steps reduce to self-definition, fitted parameters renamed as predictions, or load-bearing self-citations; the reported 7.5 h / 5.2 h figures and Gini indices are straightforward aggregates of the input data rather than outputs forced by the method itself. The derivation chain remains self-contained against the supplied mobility traces and infrastructure records.

Axiom & Free-Parameter Ledger

1 free parameters · 1 axioms · 1 invented entities

The paper's claims depend on the quality and representativeness of the trajectory dataset and the appropriateness of the 1 km threshold for defining accessibility.

free parameters (1)
  • 1 km accessibility threshold
    Chosen as equivalent to 10-12 min walking distance; this modeling choice directly affects the reported access hours.
axioms (1)
  • domain assumption Individual trajectory data accurately represents the mobility patterns of the 6 million residents.
    The analysis relies on detailed individual trajectory data for one week to compute stay locations.
invented entities (1)
  • TI-acs metric no independent evidence
    purpose: To quantify accessibility by integrating user trajectories rather than home locations only.
    New metric defined and applied in the paper.

pith-pipeline@v0.9.0 · 5826 in / 1450 out tokens · 61767 ms · 2026-05-22T14:12:43.475500+00:00 · methodology

discussion (0)

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Forward citations

Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Scalable Optimization for Mobility-Aware Coordinated Electric Vehicle Charging in Distribution Power Networks

    eess.SY 2026-04 unverdicted novelty 6.0

    MAC is a scalable ADMM-based optimization framework that couples EV charging over mobility horizons to minimize distribution network overload risks, showing major reductions in upgrade needs for a 30% EV Bay Area scenario.

Reference graph

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