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Hey coppers
Posted:
Sun Jul 20, 2014 11:37 amby Goldfish
I've been wondering this for a while now. Does radar/laser work to get your speed accurately at an angle?
My thought being they measure the speed of some thing coming at you or going away, but that's all they can do. So if a car is at a 45 degree angle to you, it is going to be going slower toward/away your point of reference, right?
Re: Hey coppers
Posted:
Sun Jul 20, 2014 11:49 amby capt1972
Goldfish wrote:I've been wondering this for a while now. Does radar/laser work to get your speed accurately at an angle?
My thought being they measure the speed of some thing coming at you or going away, but that's all they can do. So if a car is at a 45 degree angle to you, it is going to be going slower toward/away your point of reference, right?
this is physics, why are you asking a cop?
Re: Hey coppers
Posted:
Sun Jul 20, 2014 11:59 amby Redbeard
Yes it's called the Cosine Effect. At an angle the the radar reading will be slower than the vehicles actual speed. And if I remember correctly, the greater the angle, the greater the error
Re: Hey coppers
Posted:
Sun Jul 20, 2014 12:06 pmby Redbeard
capt1972 wrote:Goldfish wrote:I've been wondering this for a while now. Does radar/laser work to get your speed accurately at an angle?
My thought being they measure the speed of some thing coming at you or going away, but that's all they can do. So if a car is at a 45 degree angle to you, it is going to be going slower toward/away your point of reference, right?
this is physics, why are you asking a cop?
ImageUploadedByTapatalk1405875996.402752.jpg
Re: Hey coppers
Posted:
Sun Jul 20, 2014 12:13 pmby capt1972
Redbeard wrote:capt1972 wrote:Goldfish wrote:I've been wondering this for a while now. Does radar/laser work to get your speed accurately at an angle?
My thought being they measure the speed of some thing coming at you or going away, but that's all they can do. So if a car is at a 45 degree angle to you, it is going to be going slower toward/away your point of reference, right?
this is physics, why are you asking a cop?
ImageUploadedByTapatalk1405875996.402752.jpg
did you lose those fingers in shop class?
Re: Hey coppers
Posted:
Sun Jul 20, 2014 12:48 pmby 3legged_lab
Redbeard wrote:capt1972 wrote:Goldfish wrote:I've been wondering this for a while now. Does radar/laser work to get your speed accurately at an angle?
My thought being they measure the speed of some thing coming at you or going away, but that's all they can do. So if a car is at a 45 degree angle to you, it is going to be going slower toward/away your point of reference, right?
this is physics, why are you asking a cop?
ImageUploadedByTapatalk1405875996.402752.jpg
Your watch is on backwards.
Re: Hey coppers
Posted:
Sun Jul 20, 2014 12:51 pmby RonE
3legged_lab wrote:Redbeard wrote:capt1972 wrote:Goldfish wrote:I've been wondering this for a while now. Does radar/laser work to get your speed accurately at an angle?
My thought being they measure the speed of some thing coming at you or going away, but that's all they can do. So if a car is at a 45 degree angle to you, it is going to be going slower toward/away your point of reference, right?
this is physics, why are you asking a cop?
ImageUploadedByTapatalk1405875996.402752.jpg
Your watch is on backwards.
and inside out.
Re: Hey coppers
Posted:
Sun Jul 20, 2014 12:52 pmby Redbeard
3legged_lab wrote:Redbeard wrote:capt1972 wrote:Goldfish wrote:I've been wondering this for a while now. Does radar/laser work to get your speed accurately at an angle?
My thought being they measure the speed of some thing coming at you or going away, but that's all they can do. So if a car is at a 45 degree angle to you, it is going to be going slower toward/away your point of reference, right?
this is physics, why are you asking a cop?
ImageUploadedByTapatalk1405875996.402752.jpg
Your watch is on backwards.
its how I wear it. Saw a hipster wearing it that way a few months back. Been doing it ever since
Re: Hey coppers
Posted:
Sun Jul 20, 2014 1:00 pmby 3legged_lab
Dont lie, you've been doing it for years.
Re: Hey coppers
Posted:
Sun Jul 20, 2014 1:01 pmby Redbeard
3legged_lab wrote:Dont lie, you've been doing it for years.
ok I lied. Been wearing it that way for about 12 years
Re: Hey coppers
Posted:
Sun Jul 20, 2014 1:06 pmby 3legged_lab
Redbeard wrote:3legged_lab wrote:Dont lie, you've been doing it for years.
ok I lied. Been wearing it that way for about 12 years
OG hipster
Hey coppers
Posted:
Sun Jul 20, 2014 1:08 pmby Redbeard
3legged_lab wrote:Redbeard wrote:3legged_lab wrote:Dont lie, you've been doing it for years.
ok I lied. Been wearing it that way for about 12 years
OG hipster
yea. That's right. I am huh
Re: Hey coppers
Posted:
Sun Jul 20, 2014 5:52 pmby Goldfish
capt1972 wrote:Redbeard wrote:capt1972 wrote:Goldfish wrote:I've been wondering this for a while now. Does radar/laser work to get your speed accurately at an angle?
My thought being they measure the speed of some thing coming at you or going away, but that's all they can do. So if a car is at a 45 degree angle to you, it is going to be going slower toward/away your point of reference, right?
this is physics, why are you asking a cop?
ImageUploadedByTapatalk1405875996.402752.jpg
did you lose those fingers in shop class?
he tried to grab the last donut.
Do you have to go off what it reads regardless then I'm guessing?
Re: Hey coppers
Posted:
Sun Jul 20, 2014 5:58 pmby Redbeard
Goldfish wrote:capt1972 wrote:Redbeard wrote:capt1972 wrote:Goldfish wrote:I've been wondering this for a while now. Does radar/laser work to get your speed accurately at an angle?
My thought being they measure the speed of some thing coming at you or going away, but that's all they can do. So if a car is at a 45 degree angle to you, it is going to be going slower toward/away your point of reference, right?
this is physics, why are you asking a cop?
ImageUploadedByTapatalk1405875996.402752.jpg
did you lose those fingers in shop class?
he tried to grab the last donut.
Do you have to go off what it reads regardless then I'm guessing?
without getting into the whole procedure we use, I'll just say that any officer worth his weight in salt will position his patrol car to avoid extreme angles
We would have to go with the lower reading we get. We have no way of determining the angles and true speed. Nor would I care to go thru all that. The Cosine effect benefits you the driver.
This is all in regards to radar. I had lidar (laser) training 9 or 10 years ago and have never touched one. So I don't know how angles affect laser
Re: Hey coppers
Posted:
Sun Jul 20, 2014 11:58 pmby Goldfish
I figured as much. Thanks. I was rounding a bend and a trooper was in the median on the way onto work today and I thought there was no way he'd get a good reading before someone slowed down at that angle, but he was down in the grass and I was in a truck so maybe cars couldn't see him that soon.
Thanks red.
Re: Hey coppers
Posted:
Mon Jul 21, 2014 6:58 amby Redbeard
Goldfish wrote:I figured as much. Thanks. I was rounding a bend and a trooper was in the median on the way onto work today and I thought there was no way he'd get a good reading before someone slowed down at that angle, but he was down in the grass and I was in a truck so maybe cars couldn't see him that soon.
Thanks red.
yup
Re: Hey coppers
Posted:
Mon Jul 21, 2014 7:22 amby BrewGUN
Seriously Red, no lidar yet? I would have thought that would be standard issue in CA police cars, hell half the towns here in MI have them.
Re: Hey coppers
Posted:
Mon Jul 21, 2014 7:37 amby Redbeard
BrewGUN wrote:Seriously Red, no lidar yet? I would have thought that would be standard issue in CA police cars, hell half the towns here in MI have them.
oh we have em and they work great for what they are. But ours are handheld. Our radar antennas are mounted in the front and rear of the car. If you're stationary you have to angle your car a bit on the shoulder to hang out the window to use the lidar...because it's a handheld unit. Or stand outside your car to use it. Screw that mess. Radar's easier
Re: Hey coppers
Posted:
Mon Jul 21, 2014 7:41 amby BrewGUN
Redbeard wrote:BrewGUN wrote:Seriously Red, no lidar yet? I would have thought that would be standard issue in CA police cars, hell half the towns here in MI have them.
oh we have em and they work great for what they are. But ours are handheld. Our radar antennas are mounted in the front and rear of the car. If you're stationary you have to angle your car a bit on the shoulder to hang out the window to use the lidar...because it's a handheld unit. Or stand outside your car to use it. Screw that mess. Radar's easier
But not as cool
Re: Hey coppers
Posted:
Mon Jul 21, 2014 9:45 amby Redbeard
BrewGUN wrote:Redbeard wrote:BrewGUN wrote:Seriously Red, no lidar yet? I would have thought that would be standard issue in CA police cars, hell half the towns here in MI have them.
oh we have em and they work great for what they are. But ours are handheld. Our radar antennas are mounted in the front and rear of the car. If you're stationary you have to angle your car a bit on the shoulder to hang out the window to use the lidar...because it's a handheld unit. Or stand outside your car to use it. Screw that mess. Radar's easier
But not as cool
im waaay past the cool phase
Re: Hey coppers
Posted:
Mon Jul 21, 2014 11:06 amby Goldfish
He use it to clock himself while staring at the billboards
Re: Hey coppers
Posted:
Mon Jul 21, 2014 11:08 amby ducks~n~bucks
