Recover the road 3D model with DA3, but the metric depth looks wrong

Hi,DA3 is a great job. I want to see if I can recover the real scale 3D model of the road through DA3 by inputting the vehicle dashcam image. The depth information of each image looks good, but there seems to be a big bias in using the intrinsics to recover the true scale. I think it's a lot bigger than it really is.
The following is my code, can you give me some advice, thank you very much！

Start by reviewing the code shown in the attached images and the DA3 metric-depth and camera-intrinsics guidance. Reproduce the road-scene reconstruction and compare the supplied intrinsics with the recovered scale; done means identifying why the result is oversized or documenting the calibration required.

Written by the indexing model from the issue text.