Как найти children из clicked элементa

let car = document.querySelectorAll(".rg--car"); 
  let s = document.querySelectorAll(".car-speed"); 
  let carSpped = 0; 
  for (let i = 0; i < car.length; i++) { 
    car[i].addEventListener("click", function(e) { 
      e.target.parentNode.classList.toggle("rg--selected"); 
      if (car[i].classList.contains("rg--selected")) { 
       //code here 
      } 
    }); 
  }