E311 and E611 carry heavy truck traffic moving at 120 km/h or more, and the hard shoulder is one of the most dangerous places in the country to stand. If a tyre lets go, do not stop in a live lane and do not stop on a left-hand shoulder if you can possibly avoid it. Signal early, ease across to the right, and keep rolling on the flat, slowly, hazards on, until you reach an exit, a petrol station or at least a wide section of shoulder well clear of a bend or an on-ramp. A destroyed tyre costs a few hundred dirhams; the alternative risk is not comparable.
Then decide honestly whether to change the wheel yourself. On a quiet street, changing a tyre is a fifteen-minute job. On the E311 shoulder with trucks passing an arm's length away, it is work for someone with a liveried vehicle, cones and practice, and a traffic-side rear puncture should almost never be a DIY job there. A callout to fit your spare typically runs AED 150-250, and many vendors can plug a simple tread puncture on the spot or bring a matching tyre for more. Modern cars with no spare at all, an increasing share of the market, take the decision out of your hands: you are booking a callout or a tow either way.