Do Sunshades Work? Do Sunshades Keep Car Cooler?

it is getting hot outside and I’m wondering if sunshades work and do sunshades keep car cooler? Do reflective sunshades work better to keep your car cool? My car sits in the sun and it feels like an oven when I get inside of it. what I discovered in this review is that car sunshades present a very dangerous hazard for drivers.

is it worth it to use a sunshade to keep your car cooler if it could increase your chances of getting in a car accident by reducing your visibility drastically?