I used to do loads of time trials
Partly because I thought they were of value - but mainly I would get a bit bored just going for a normal steady run so would go for my course pb's
I new I was never going to be a great runner or even close so did some training which I just enjoyed
They are of value but once or twice per week is too much
Do you really want do have a 1500m time only 2 seconds faster than you have done in training like me! Although a teamate pace me for this after the track season closed & I was in really good shape
The trouble is you can end up better at time trails than races. The main problem was I found if I could get to the front of the race it made no difference but in a better field it was really hard to get runners well ahead of me and I wouldn't race as well as I could have
Plus I was doing too many training sessions fast and you stop improving that way
After all that rambling I would like to add that time trials are very important but don't do them too often and if possible use a low priority race instead you might as well have a new pb instead of a load of course records around your home town like me. Nobody else ran them! New Mills to Hayfield on trail and back on hilly road 27.27 the record still stands!!!
However, the fundemental problem with all training is it does not replicate a race. Lydiard was right in that its the one time you are not getting any rest or going at a slower pace.
Speaking to EA's they frequently run not time trials but a race. From one Kenyan telling about his first training camp runs as a junior 'they dropped us of on the top of a mountain and said be very careful - lots of mountain lions and wild animals are here' He told me he had never run so fast - nobody wanted to be the last runner!
and one more thing don't post all this prediction crap on here - get out there and run it or wait until the race - you will find your own pace on the day