Comment by softgrow

If you ring for the ambulance, (Australian context), you will be told what to do! The telephony scripts have first aid baked in. The paramedic will come (not necessarily with an ambulance) and start appropriate definitive treatment as good as what you will get in a hospital. A consequence of a stroke is a cardiac arrest. If you are driving you won't know and won't do CPR.

The 1996 movie Transpotting still gives me shivers up my spine by putting someone in a car and drop at ER rather than calling for help. Too many people die needlessly, even today, when well meaning people load shooting victims, stroke victims and heart attacks etc into their car and drive to ER without asking their local emergency services for advice.

PS. You can't 100% of the time get to ER faster than the ambulance. There are more ambulances than emergency rooms by number. If an ambulance is at the county hospital they'll be faster than you.