Why do vehicles in Nanshan, Shenzhen have the highest quality?

Compared to Luohu, Futian, Bao'an, and Longgang, the vehicles on Nanshan's roads have relatively better quality.

Because traffic rules are enforced most strictly there, and the penalties are also the heaviest.

Illegal parking: 500🥶, 200 in other areas.

And at crosswalks, drivers must yield to pedestrians by three car lengths. If they don't yield, it's also 3 points deducted and 200 in fines.