This dataset is created by MonoTTA: Fully Test-Time Adaptation for Monocular 3D Object Detection, based on KITTI.
You can check this link for more details:
https://arxiv.org/abs/2405.19682v1
And access the code:
https://github.com/Hongbin98/MonoTTA
Please double-check the demands of KITTI when you try to download this dataset and obey their rules.