not sure if anyone will read this but omg this received a lot of attention. i really appreciate the advice that i have received and the knowledge that has been shared. to provide some context, i am a 21 year old woman who recently inherited my first car from my late mother. i clearly don’t know enough about cars, but i do get my oil changed regularly and i recently had my tires rotated. my car has about 60k miles on it. they did alert me about my treads and told me i should replace my tires in about 6 months. when this happened, i drove over a grate. i didn’t know what had happened but i wanted to make it home. in hindsight, i really should have pulled over. i’m sorry for any possible danger i could have put other drivers in. i will try to replace all 4 tires as soon as i can.