Granted, riding around White Rock Lake isn't necessarily the best location for "time trialing," given the multi-use aspect of the place -- but it's certainly nice for speed in lots of places, and the ~9 mile loop is certainly challenging.
 
I was out at White Rock this morning, and after doing a regular lap, decided to do a "speed lap" based partially on what Tony and others recently posted about the "30-minute lap goal"...  However, I was also concerned about pedestrians and overall safety.  So, I came up with this counterclockwise run, which helps reduce the number of people you have to pass (or pass close to) --  
 

 
Start on the west side on Lawther Drive, right where the trail access comes out onto the road.  Zero out your computer, and hit it!
 

 
Follow the road south, all the way out, not turning onto the railroad bed paved stretch - instead, stay on West Lawther, climbing the "Dolly Parton" hills, turning right and going down to Winstead, and over to the 7-11
 

 
At the 7-11, get back on the path, climb the spillway, and stay on the path and street  for the normal route along the east side, finishing right where the path from the footbridge comes out on East Lawther.
 

 
I rode it, and braked to a quick stop right at the finish point, and read my computer.  According to RideWithGPS, this is 8.7 miles.  According to my bike computer, it's 8.5 miles.  What I LIKE about it, is that it totally avoids the footbridge and winding path at the north end, which is often crowded with walkers and other cyclists.  Yes, there are a couple stop signs on West Lawther, and a bit of hill climbing.
 
May I be so presumptuous as to suggest this be the "standard" speed loop (or speed 'U'), in reference to those wanting to do that kind of self-measurement at White Rock?  If so, ride the "U", and use this thread to post your runs...  And like I tell the GDB folks about the monthly Mesquite Time Trial that I'm trying to revive, you're not competing against others, you're competing against YOURSELF through the course of the season!
 
Again, be careful out there -- we're playing in traffic, and WRL is multi-use...  be smart, and obey applicable traffic laws...  

I did clock wise three yrs ago in 35 min flat with the thunderbolt.

My fastest lap was on the LeMond when I was barely sixty years old!  Then I went from Scout Hill parking lot, clockwise, using the road as much as possible, and the finish was over the Mockingbird bike lane, for 9.7 miles.  PB was 30:36, for 19.0 mph.  My fastest 'bent lap is just over 34 minutes for the roadier 9.5 mile lap, about 16.7 mph.  These are typically weekday afternoons, with light traffic.  I expect Jay and Slack Sails to challenge me to improve on that this summer!  

Quote from mleuck on Apr 2^nd, 2013, 10:15pm:

 
hmmm........ interesting  
 
I have done some projections ......... better watch out Mark.
 

 
   *This is what Data Analysts do when they have free time at work

Quote from TonyWard on Apr 3^rd, 2013, 3:03pm:

 
 
I will fondly remember this chart and speak of it quite loudly the next time I fly past you...

I almost always go clockwise too (going down the spillway hill is fun) and ALWAYS avoid the foot-bridges on the north side.  They're a gauntlet!  Perhaps I will try this counter-clockwise route, not that I could beat you guys!  Ha ha.

Here's my clockwise 21 average from yesterday, nobody around to race so I had to play with several cars on the west side.
 
I take the old railroad bike path north instead of taking the Dolly Partons because they added an additional stop sign and I've had enough tickets over the years.  
 

Quote from jdorlon on Apr 16^th, 2013, 2:03pm:

 
 
It reminds me of the joke that, when you used to see people walking down the street talking to nobody, you figured they were a crazy person -- now they're just talking on a bluetooth phone.
 
Now, you see somebody pedaling like mad down a street or path, and think, "why are they hammering like that, here?"   They're "virtual racing"...