-Ralph-

You need to regain control of the situation.

Stay calm. Give yourself the time you need to plan, process information and react without needing to panic. Often that just means going slower.

Use the road signs, hedgerows, street lighting, etc to get advance warning of where these junctions are, and loose some speed on approach with a gentle roll off the throttle. Just by doing this you will feel more in control before you even get to the junction. If there's a car waiting treat it as a potential hazard and don't zip past it's nose at 70mph, travel at an appropriate speed for the situation. Position your self in the drivers line of sight. Plan and be mentally ready to take an escape route or stop in the distance you can see to be clear if the other vehicle moves. Watch for the signs people have mentioned on here, such as eye contact (be wary, looking directly at you and seeing you are two different things), wheels starting to turn, brake lights going off, etc, so that if the vehicle does move, it's not a surprise.

If there isn't a vehicle there, look over hedgerows, etc, and as soon as your satisfied a hazard is not going to appear from that junction, roll back on the throttle and get on your way back at your normal speed.

At the moment you are not mentally or physically calm, you are getting anxious, dealing with the threat only as you are faced with it, tensing up, throttling off and watching like a hawk which is target fixation (allowing your brain to focus your eyes on the threat).

When you ride you need to look like you have all the time in the world. When a car does pull out on you, you shouldn't be having a panic swerve or brake. You were expecting it and should either be riding round a planned escape route, or braking to a stop, whilst shrugging your shoulders, shaking your head, and thinking calmly to yourself "silly *****, I knew he was going to do that!"