Students will draw in bearings on a paper based copy and see for themselves whether there is a crash or not. I copied an image before the simulation and after. Also when two planes have collided a third plane is safe to enter that position as presumably the collided planes have fallen to the ground. Remember it is not enough to say two flight paths intersect, the planes need to be at the same place at the same time before a collision takes place. Each time you refresh the page you get a new situation so all of the pupils could be working on a different problem. As an alternative way of using this resource you could print out this page and ask the pupils to accurately draw on the flights paths using ruler and protractor. You can see the answer by running the simulation which shows how the situation unfolds. They need to decide, given the direction of travel, whether any of the aircraft will collide or whether they will safely fly out of the airspace covered by this radar screen. This is an exercise in estimation assuming that the pupils understand three figure bearings.
