Everyone has a cellphone these days. If a person doesn’t know proper first aid procedures, they can call 911 for an ambulance and do what they can to pull the person to safety out of oncoming traffic. If they know first aid, they should use it and worry about lawsuits later. This is no excuse for people not to care anything about anybody else like is rampant these days.
Some 911 centers offer 'pre-arrival' instructions while the aid car is enroute.