A: ok, I've got an up-to-day map. Let's check the route from here to the airport.
B: where are we? Oh, here we are. So we drive to the A120 and turn left.
A: no, we turn right. Remember that we are coming from this direction.
B: oh yes! Sorry! Then we drive to the M11 motorway.
A; how far is that?
B: it's only seven miles. We turn left to join the motorway and drive south.
A: according to the map, we get off the M11 at the second junction and join the M25. that's the motorway that goes around the edge of London.
B: that's another 15 miles, so that's 22 miles total so far.
A: then we drive west on the M25. we must be careful to turn in the right direction!
B: then we drive on the M25. it turns south. When we reach exit 15, we turn left and go west along the M4.
A: then we take the first Heathrow Airport. What's the total distance?
B: the journey around the M25 is 33 miles and then 3 extra miles to get to the airport. So how many miles is that together?
A: 22 miles to the M25, 33 miles on the M25, and 3 after that. That's a total of 58 miles, isn't it?
B: it shouldn't take us very long to cover that distance. Remember that we can go quite fast on the motor way.
A: we can only go fast on the motor ways if there isn't much traffic. I think we should allow ourselves plenty of time to get there. Being early is much better than being late.
