Integrating other sensor modalities with 4D radar data can enhance the robustness and accuracy of the human detection system in challenging environments. Thermal cameras can provide complementary information about the environment, especially in low-light conditions or when visibility is limited due to factors like smoke or fog. By fusing thermal imaging data with 4D radar data, the system can improve its ability to detect humans by leveraging the unique characteristics of each sensor modality. Ultrasonic sensors can further enhance the system by providing distance measurements and detecting obstacles in close proximity to the vehicle. Integrating data from multiple sensors through sensor fusion techniques, such as Kalman filtering or Bayesian inference, can create a more comprehensive and reliable perception system for human detection.