Possible explanation please

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How about this one...

(probably as good as the fisrst post but as I haven't slept that will be my excuse)

I was driving home last night, at about 10 o'clock on a main road ,doing between 50 and 60, and I noticed to my left above a field what appeared to be a model aeroplane with two coloured lights at either side, either blue and red or green and red (not sure why I don't know which). After thinking 'why would anybody be flying modelplane at that time of night' I looked again and noticed there were two of them. I looked a third time and they were now about 90 degrees from me but I could clearly make out that they were triangular and shaped like a 'boomerang', only with a sharper/more pointed angle, with the two lights at each end (I think the lights must have enabled me to make out their shape which i could see clearly)

The next thing I noticed was that that they were swerving and crossing eachother as though people were controling them by radio contol. I think they were about the length of a car in size and proportionally, as I say, like a boomerang and were approx 10-15 ft in the air. It wasn't until I had driven for a few minutes that I thought they might have been UFOs.... I wanted to turn around and go back but as it was a busy road with narrow lanes I wouldn't have been able to park.

I'm actually convinced they were model aircraft of some sort but how could they be shaped like that. Anyone offer any explanations?