Possible Incorrect Reading

Rill

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This isn't my ticket, but I'm trying to figure out if there is a way to help my little cousin out.

As the story goes, my cousin was driving ~60mph on a 55 PSL road.
The road had 2 lanes in either direction, only separated by a double strip of paint.

He passed a car on his left, then merged and passed one on his right.
Somewhere about half way between passing these cars, an approaching police car clocked him at 85mph with radar, and pulled him over.

The officer was following another car when he clocked my cousin, and I'm wondering if the leading car could have messed up the radar's ground speed calculation, and resulted in a false reading of 85.

Hopefully the diagram below helps explain the situation.
ticketDiagram.PNG



Essentially, I'm just trying to think of any possible reason for a false radar reading.
At first I wondered if the radar could have been confused as he merged into the left lane, jumping from the location of the car behind him, to his car. However it seems that radar guns use the Doppler of individual pulses, instead of the difference in distances between pulses.
With that in mind, the only mitigating factor I can think of is that the Police Car could have been approaching the car in front of him, messing up the ground speed reading, and inflating the reported speed.

Let me know if anyone has experience in this area, or any suggested reading to learn more about this!

Thanks!
-Rill
 

erickonphoenix

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Depending on the brand of radar you could get different results. Stalker's strongest/fastest tech is pretty solid. But you still have to interpret the speed readings based on what your seeing. So there's lots of room for interpretation error.
 

Rill

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Depending on the brand of radar you could get different results. Stalker's strongest/fastest tech is pretty solid. But you still have to interpret the speed readings based on what your seeing. So there's lots of room for interpretation error.

I'm waiting to hear back about the brand/serial of the radar gun. All I know for now is that it took place in California.

Do you think a judge would be in any way sympathetic to a claim that the radar was confused?
 

Bossdad71

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I'm waiting to hear back about the brand/serial of the radar gun. All I know for now is that it took place in California.

Do you think a judge would be in any way sympathetic to a claim that the radar was confused?
cali uses stalker I believe
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Do you think a judge would be in any way sympathetic to a claim that the radar was confused?
most judges no, they work for the city or county, and will always side with the cop. Well almost always.
 

TurboDriver

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From my radar experience usually the radar gets its reading from something, something that is actually that speed, the issue is determining what object it is.

The only thing I have seen is in moving mode sometimes it will not calculate the patrol speed correctly and the computer math is off and it will not subtract the patrol speed from the total doppler change. This from what I normally see this gives a very high reading of total closure speed on the highway like 100-130+.
 

Transporter

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You absolutely need to find out the exact Radar that was used. If it was Stalker, I would be inclined to think your cousin just didn't notice he was speeding because if he was only 5 over, why the need to pass somebody on the Right then jump out to pass somebody on the Left and get nailed? Sounds more like he WAS speeding in the scenario you provided IE who was going 50 in the left lane (not even the PSL) that needed passed on the Right. Sounds like he is looking for excuses to find a way to get out of a ticket. Don't get me wrong, nobody likes paying tickets.
 

Rill

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You absolutely need to find out the exact Radar that was used. If it was Stalker, I would be inclined to think your cousin just didn't notice he was speeding because if he was only 5 over, why the need to pass somebody on the Right then jump out to pass somebody on the Left and get nailed? Sounds more like he WAS speeding in the scenario you provided IE who was going 50 in the left lane (not even the PSL) that needed passed on the Right. Sounds like he is looking for excuses to find a way to get out of a ticket. Don't get me wrong, nobody likes paying tickets.

I'll get the exact radar soon, he's reaching out to the police department.

It's entirely possible that he was actually going 85 mph, as the radar stated, not 60 mph as he claims... However, I'm choosing to believe him for now, and try to come up with the most realistic scenario that supports his claim.

But yes, I agree that the passing seems aggressive for 60mph.
Post automatically merged:
From my radar experience usually the radar gets its reading from something, something that is actually that speed, the issue is determining what object it is.

The only thing I have seen is in moving mode sometimes it will not calculate the patrol speed correctly and the computer math is off and it will not subtract the patrol speed from the total doppler change. This from what I normally see this gives a very high reading of total closure speed on the highway like 100-130+.

Yeah, it seems like it's difficult to get an 85mph reading from a messed up ground speed.
By my logic, the police car would need to be approaching the car in front of it at ~25mph to goof the reading. And that seems awfully fast to approach someone.
 
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