I heard a myth that the color of your car makes a difference in how much more or less likely you are to get caught speeding. Specifically, I heard that radar guns are more sensitive to red cars.

Is that true?

I doubt the color itself makes a difference to the radar or laser speed guns. (Unless there's something in the pigment that makes the radar/laser beams bounce back to the scanner better, or something.)
Red does, however, tend to attract human attention. (I've seen this in my store many times.) This might account for police spotting a speeding red car more often than one of a different color.
I don't know if this would account for a significant increase, though.
Does anyone have access to records that might prove (or disprove) something like this?

I have to agree that it isn't the radar gun that is effected by the color of the car but the cop using it. If you have a flashy paint job you stand out from the crowd.

This is also why fire trucks are painted bright red or sometimes Yellow. The more it stands out the more likely people be will notice and clear the road for it.

And besides.. Many of the "supercars" are often painted red.. Like the Porsche 911, The Ferarri and the Lamborghini.

It's the basic painted-zebra phenomenon. When a lion sees a herd of zebra, it just sees a confusing mass of black and white stripes that pretty much all look the same, and the lion can't pick out any one individual to go after. But paint a red spot (or any other distinguishing feature) on one zebra in the herd, and that'll be the first one the lion goes for. If you want to avoid attention (from lions or cops), it pays to look as much like the rest of the herd as possible.

I have a red car myth of my own. I read about this on the internet once. Supposedly you are more likely to have car crashes if your car is red. The same myth says that you are least likely if your car is silver.

I'd have to call this one busted, especially since I had a red car and a silver one for 2 years and the red one was never wrecked while the silver was wrecked twice. However I'd like to know what everybody else here thinks.

I'd think it'd be the reverse of that. Red cars stand out more, so other drivers are more likely to see them and take whatever means necessary to avoid a collision. I've heard several people say that "silver cars are invisible".

However, there is another factor - The type of people who choose to own a bright flashy red car tend to be a.) young and reckless, b.) older and overcompensating for a midlife crisis, c.) trying to attract attention from members of the opposite gender, or some combination of the three. All of these are likely to make one a less attentive and more dangerous driver, and thus more likely to cause an accident.

It's hard to say which factor would have more effect.