Coming off the A7 at the Salou / Airport kunction the slip road rises to a peak and then falls down to the the roundabout a few hundred metres further on. Were anyone distracted by perhaps, texting, reading a novel or writing their memiores, they may fail to notice the impending requirement to give way.
With great foresight, our great leader(s) have foreseen this and changed the speed limit from 120km to 70km at the highest point.
Should there then, be any obstruction, such as a mobile speed  camera concealed just over the hill then all will be well as all will have reduced their speed in good time. How great is our leader to care for us in this way. May he live forever.
I, of course, was not in danger of exceeding the speed limit as the queue caused by closing a lane for the camera and police cars backed well onto the motorway. Such foiresight!