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Open Access Research Article Issue
Dynamically local-enhancement planner for large-scale autonomous driving
Communications in Transportation Research 2026, 6(3): 9640020
Published: 30 September 2026
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Current autonomous vehicles are typically deployed within limited geographic regions, while scalable operation across diverse locations is increasingly demanded. As deployment regions expand, planners must cope with heterogeneous traffic dynamics under fixed onboard computational and memory budgets, where adapting a single monolithic model through data aggregation or parameter expansion becomes inefficient and costly. This paper proposes the dynamically local-enhancement (DLE) planner, which improves region-level adaptability without increasing policy capacity or performing full online policy optimization during deployment. Global driving competence is decoupled from region-specific adaptation through explicit region-conditioned representations. Long-term regional characteristics are distilled into map-level historical memory via a latent-variable encoder, while real-time interactions are modeled by a dual-layer traffic graph neural network that jointly captures vehicle interactions and road topology. The resulting region-conditioned representation is used to condition a shared reinforcement learning planner at inference time, where dynamic behavior arises from location-indexed retrieval and conditional forward inference rather than parameter growth. We evaluate DLE in multiregion closed-loop car learning to act (CARLA) benchmarks. Under a fixed parameter budget, DLE consistently improves cross-regional adaptability and outperforms baselines in safety and comfort metrics. These results indicate that memory-based region-aware enhancement offers a practical paradigm for scaling autonomous driving planners under deployment constraints.

Issue
End-to-end autonomous driving map generation: a survey
Journal of Tsinghua University (Science and Technology) 2026, 66(8): 1587-1610
Published: 31 August 2026
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Significance

Autonomous driving maps are essential for the safe operation of intelligent vehicles, especially on Chinese urban roads, where road structures are complex and traffic conditions change frequently. For a long time, map production has relied on specialized surveying and extensive manual annotation, resulting in high costs, low efficiency, and long update cycles, making large-scale coverage and continuous updating difficult to sustain. Under these conditions, end-to-end autonomous driving map generation has gradually become an important direction in this field. Its fundamental goal is to infer structured map outputs more directly from sensor observations, thereby reducing dependence on complex intermediate procedures and intensive manual intervention. With the continued development of deep learning, the two core tasks of autonomous driving map generation—lane network generation and lane topology prediction—have both shifted toward end-to-end approaches. Concurrently, industrial end-to-end systems have been developed for city-scale map production and updating, while large models, vision-language models, and agent-based systems have further expanded the research space in this area. Nevertheless, several challenges remain unresolved, including generalization in complex scenes, dynamic change detection, interpretability, and consistency in multi-vehicle collaboration. Therefore, it is important to systematically review existing research to provide clearer guidance for the future development of this field.

Progress

For lane network generation, the technical route has evolved from early convolutional neural network (CNN)-based methods to Transformer-based and hybrid architectures. CNN-based methods were widely adopted at an early stage due to their mature operators, stable training, and low deployment cost. They are effective in modeling local geometry; however, their ability to preserve long-range structural consistency becomes more limited in complex scenes. Transformer-based methods later emerged as a major direction because query-based decoding is well suited for structured instance prediction and global relation modeling. Subsequent studies further expanded this line of work to include geometric constraints, map element representation, prior-guided prediction, and temporal consistency in online mapping. Hybrid architectures combine convolutional feature extraction, Transformer-based reasoning, graph modules, and temporal memory, enabling local geometric precision, topological consistency, and engineering feasibility to be addressed within a unified framework. A similar shift can be observed in lane topology prediction. Early methods mainly relied on local connection inference, whereas later studies increasingly treated topology as a structured prediction problem involving order, connectivity, and global consistency. Transformer-based methods strengthened long-range dependency modeling and gradually incorporated geometry, order, connectivity, and generation into a more unified framework. In contrast, graph neural network-based methods explicitly represent node relationships, edge constraints, and multi-scale connectivity patterns through graph structure. Hybrid methods further combine segmentation, sequence modeling, graph reasoning, and redundant supervision to improve robustness in complex road scenes. The main challenge is no longer limited to recovering local geometric shapes, but increasingly lies in maintaining structural consistency when map elements, topological relations, temporal information, and prior knowledge are considered together. Beyond these academic methods, industrial practice has also developed end-to-end map generation systems for large-scale urban deployment, aiming to improve automation, reduce production costs, and shorten update latency. Related studies also cover online high-definition map construction and pseudo-label learning under weak or missing annotations. Meanwhile, large models and vision-language models have gradually entered this line of research. Their potential in map generation has attracted increasing attention; however, their practical use is still constrained by data quality, structural priors, engineering controllability, and the requirements of real production environments.

Conclusions and Prospects

Overall, end-to-end autonomous driving map generation is reshaping the conventional map construction paradigm and has shown clear advantages in process simplification, timeliness, and structured prediction. With the introduction of large models, vision-language models, and agent-based systems, map generation may gradually move beyond geometric construction toward a stage that also involves semantic understanding and human–machine interaction. Further progress in this direction will depend not only on model capability but also on the establishment of stable data pipelines, quality control mechanisms, and closed-loop engineering workflows, thereby supporting the large-scale and stable deployment of autonomous driving systems.

Open Access Just Accepted
End-to-end Hierarchical Visual Localization with Rasterized and Vectorized HD Map
Communications in Transportation Research
Available online: 31 August 2026
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Downloads:34

Accurate localization serves as an important component in autonomous driving systems. Traditional localization methods involve many standalone modules, which require complex hand-crafted rules and costly hyperparameter tuning by trial-and-error, therefore sacrificing the accuracy and generalization. In this paper, we propose an end-to-end visual localization approach, RAVE, in which the surrounding images are associated with the HD map data to estimate poses. To ensure high-quality observations for localization, a low-rank flow-based prior fusion module (FLORA) is developed to incorporate misaligned map prior into the perceived BEV features. Pursuing a balance among efficiency, interpretability, and accuracy, a hierarchical localization module is proposed, which efficiently estimates poses through a decoupled BEV neural matching-based pose solver (DEMA) using rasterized HD map, and then refines the estimation through a Transformer-based pose regressor (POET) using vectorized HD map. The experimental results demonstrate that our method can perform robust and accurate localization under varying environmental conditions while running efficiently. 

Open Access Research Article Issue
PriorFusion: Unified integration of priors for robust road perception in autonomous driving
Communications in Transportation Research 2025, 5(4): 100229
Published: 18 November 2025
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Downloads:39

With the growing interest in autonomous driving, there is an increasing demand for accurate and reliable road perception technologies. In complex environments without high-definition map support, autonomous vehicles must independently interpret their surroundings to ensure safe and robust decision-making. However, these scenarios pose significant challenges due to the large number, complex geometries, and frequent occlusions of road elements. A key limitation of existing approaches lies in their insufficient exploitation of the structured priors inherently present in road elements, resulting in irregular, inaccurate predictions. To address this, we propose PriorFusion, a unified framework that effectively integrates semantic, geometric, and generative priors to enhance road element perception. We introduce an instance-aware attention mechanism guided by shape-prior features, then construct a data-driven shape template space that encodes low-dimensional representations of road elements, enabling clustering to generate anchor points as reference priors. We design a diffusion-based framework that leverages these prior anchors to generate accurate and complete predictions. Experiments on large-scale autonomous driving datasets demonstrate that our method significantly improves perception accuracy, particularly under challenging conditions. Visualization results further confirm that our approach produces more accurate, regular, and coherent predictions of road elements.

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