This reply was so positive and full of energy, it inspired me, so I brought the old app out of the garage and gave her one last feature.
I give you, Car Radar v1.6 -
Rear Cut Off Distance
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Adjust the red line with the new "REAR CUT OFF" setting to remove the clutter of cars behind you. Setting is defaulted to previous app behaviour so don't worry if you don't want this, just don't touch the setting.
Also included is hopefully a fix for the app crashing when the config file is empty/corrupted. I still don't know why it happens sometimes but the worst thing that happens in this rare occurrence is you lose your settings, rather than the app crashing.
Thanks to
@Ripp_ for the great idea and inspiration to go back in to that crazy spaghetti code I wrote 6 years ago!