Different percent looks odd, if you gonna do 30, in rear might as well do 20 all around

 

But there is another danger that could cause a serious accident. You may not see a child crossing a street at night from either side if the tint is too dark. That’s why, in California at least, front windows have tint restrictions. Why 5% is allowed for limo drivers is one of those legal loopholes that sadly will be eliminated the first time a pedestrian is killed.