This paper studies road user trajectory prediction in mixed traffic, i.e. where vehicles and Vulnerable Road Users (VRUs, i.e. pedestrians, cyclists and other riders) closely share a common road space. We investigate if typical prediction components (scene graph representation, scene encoding, waypoint prediction, motion dynamics) should be specific to each road user class. Using the recent VRU-heavy View-of-Delft Prediction (VoD-P) dataset, we study several directions to improve the performance of the state-of-the-art map-based prediction models (PGP, TNT) in urban settings. First, we consider the use of class-specific map representations. Second, we investigate if the weights of different components of the model should be shared or separated by class. Finally, we augment VoD-P training data with automatically extracted trajectories from the 360-degree LiDAR scans by the recording vehicle. This data is made publicly available. We find that pre-training the model on auto-labels and making it class-specific leads to a reduction of up to 22.2%, 20.0%, and 18.2% in minADE (K = 10 samples) for pedestrians, cyclists, and vehicles, respectively.

Automated Vehicles (AVs) rely on up-to-date map information to inform trajectory prediction and planning modules, but these maps are expensive to obtain and update as they are usually annotated by humans. We propose SAM-Maps, a method for automatically generating road maps from aerial images of urban areas that takes advantage of the power of foundation models, requiring no human annotation or additional training to map unseen areas. This method extracts a coarse road graph from the images and then estimates the geometry of the roads from this graph. We evaluate our model on the challenging road layouts of the recent View-of-Delft Prediction dataset by comparing the maps generated using our model to the human-annotated maps, achieving an IoU of 33.3% with our automatic method and an IoU of 56.1% with some human corrections in our method. We also evaluate a trajectory prediction model on our maps to test whether they are sufficiently accurate for downstream tasks. The performance of this model using the map from our automatic method is 37.9% better on the minADE6 metric than not using map data as input. To the best of our knowledge, this is the first method that extracts both the drivable area and road connections of European urban areas from aerial images. The code will be publicly released for research purposes.

This letter presents View-of-Delft Prediction, a new dataset for trajectory prediction, to address the lack of on-board trajectory datasets in urban mixed-traffic environments. View-of-Delft Prediction builds on the recently released urban View-of-Delft (VoD) dataset to make it suitable for trajectory prediction. Unique features of this dataset are the challenging road layouts of Delft, with many narrow roads and bridges, and the close proximity between vehicles and Vulnerable Road Users (VRUs). It contains a large proportion of VRUs, with 569 prediction instances for vehicles, 347 for cyclists, and 934 for pedestrians. We additionally provide high-definition map annotations for the VoD dataset to enable state-of-the-art prediction models to be used. We analyse two state-of-the-art trajectory prediction models, PGP and P2T, which originally were developed for vehicle-dominated traffic scenarios, to assess the strengths and weaknesses of current modelling approaches in mixed traffic settings with large numbers of VRUs. Our analysis shows that there is a significant domain gap between the vehicle-dominated nuScenes and VRU-dominated VoD Prediction datasets. The dataset is publicly released for non-commercial research purposes.