Do police have relative-speed radar yet?

[Smashy]

I'm not even sure if these exist.. but they seem very feasible. Radar guns that connect the car's spedometer to display either the relative velocity of the vehicle ahead, or add the vehicle's relative velocity to that of the cruiser's to show the car's speed. It would be interesting if cruiser's were equipped with these...

[Spray]

If you're asking wether or not police cars can zap you while both you and them are driving than yes, yes they can.

[Smashy]

If you're asking wether or not police cars can zap you while both you and them are driving than yes, yes they can.

Serious eh. So do they basically work using relative speeds and connected to the cruiser's spedometer?

Or do they just use a normal radar gun.. and see if you are going WAY over?

[Spray]

from what i understand it's a laser, they can have them facing front and back, I have no idea how they measure the exact speed.

[GangStarr]

for an officer to gain an accurate measure of your speed he must be going either 0 km/h or a steady speed of say 110 km/h

if the officer isn't going a steady speed his radar isn't accurate.

[seshwan]

for an officer to gain an accurate measure of your speed he must be going either 0 km/h or a steady speed of say 110 km/h

if the officer isn't going a steady speed his radar isn't accurate.

I got nailed by a cop going the opposite direction, he pulled a U-turn and followed me. Said I was doing 88 in a 50, but he just gave me a warning. Maybe it was because he knew that number wasn't completely accurate.

[cwb27]

I'm not even sure if these exist.. but they seem very feasible. Radar guns that connect the car's spedometer to display either the relative velocity of the vehicle ahead, or add the vehicle's relative velocity to that of the cruiser's to show the car's speed. It would be interesting if cruiser's were equipped with these...


Of course they do! They've had it for years (decades)!

This is also one of the reasons why police cars that run in vehicle radar must have a certified speedometer.

Now, a handheld gun is a different story. But anything vehicle mounted is properly calibrated to know how fast the police vehicle is moving and to factor that in while calculating the target vehicle's speed.

[Sonbuster]

I'm not even sure if these exist.. but they seem very feasible. Radar guns that connect the car's spedometer to display either the relative velocity of the vehicle ahead, or add the vehicle's relative velocity to that of the cruiser's to show the car's speed. It would be interesting if cruiser's were equipped with these...

why?

[gman]

Of course they do! They've had it for years (decades)!

This is also one of the reasons why police cars that run in vehicle radar must have a certified speedometer.

Now, a handheld gun is a different story. But anything vehicle mounted is properly calibrated to know how fast the police vehicle is moving and to factor that in while calculating the target vehicle's speed.

Yes, they had that for decades. My friends got nailed by those in 80's.

[Shaner]

for an officer to gain an accurate measure of your speed he must be going either 0 km/h or a steady speed of say 110 km/h

if the officer isn't going a steady speed his radar isn't accurate.

That is completely untrue. Even if the cop slams on the brakes while he's in the middle of getting a reading, the listed speed of the car in front of him won't change.

[Bazooka Joe]

Not all cop cars necessarily have them, it depends on the district/agency. In 1999 the OPP was installing them on cars in some of their more romote stations. If my memory serves me (I had a friend who was an OPP officer) they will passively monitor 5 cars in front and two behind at all times.

[Harkonnen]

If you're in a convoy of vehicles, all of which are speeding; can the police (read: one police cruiser) pull over the entire convoy for speeding, or do they just pick a car and catch that guy?

In the States (somewhere in Michigan) I saw one cop car pull over 3 speeding cars (one was following another which was following the first) in one shot. I haven't seen that done here.

[Bazooka Joe]

If you're in a convoy of vehicles, all of which are speeding; can the police (read: one police cruiser) pull over the entire convoy for speeding, or do they just pick a car and catch that guy?

In the States (somewhere in Michigan) I saw one cop car pull over 3 speeding cars (one was following another which was following the first) in one shot. I haven't seen that done here.


Can they? Sure they can. That's like asking if the cop can arrest 3 people at once doing something illegal.

Do they? That's another story. I've never seen it if they're in a moving cruiser. I have seen it if they're on the side of the road though. Theoretically they can, but I don't think they do.

[162]

If you're in a convoy of vehicles, all of which are speeding; can the police (read: one police cruiser) pull over the entire convoy for speeding, or do they just pick a car and catch that guy?

In the States (somewhere in Michigan) I saw one cop car pull over 3 speeding cars (one was following another which was following the first) in one shot. I haven't seen that done here.

If they're following closely to each other they can only target the first vehicle with any degree of certainty.

[162]

for an officer to gain an accurate measure of your speed he must be going either 0 km/h or a steady speed of say 110 km/h

if the officer isn't going a steady speed his radar isn't accurate.

wrong - the officer simply must be mobile or stationary and be in an almost direct line either facing front or rear of the vehicle.

[gman]

If you're in a convoy of vehicles, all of which are speeding; can the police (read: one police cruiser) pull over the entire convoy for speeding, or do they just pick a car and catch that guy?

In the States (somewhere in Michigan) I saw one cop car pull over 3 speeding cars (one was following another which was following the first) in one shot. I haven't seen that done here.

Cops could have worked as a team. That is a cop with a laser radar gun stations on a bridge (and you may not notice). ID 3 cars was speeding. Call the cop driving in the cop car nearby to pick them up. I also saw that set up with a fleet of cop cars standby in the states.

[gq_fuzion]

thanksgiving long weekend... OPP did that with their chopper

[ch1zo]

does anyone know if its true that a cop cant give u a ticket if you are behind them?
just out of curiousity:cheesygri

[Shaner]

does anyone know if its true that a cop cant give u a ticket if you are behind them?
just out of curiousity:cheesygri

That's not true. A cop can ticket you whether you are behind or in front of their cruiser. The radar device can be equipped to scan all cars coming from behind or all cars coming towards the cruiser.

[Smashy]

does anyone know if its true that a cop cant give u a ticket if you are behind them?
just out of curiousity:cheesygri

Or if you go at the same speed as a cruiser, even though both of you are speeding (or above the limit by maybe 15 or more KPH)? Hmmm...

[cwb27]

Or if you go at the same speed as a cruiser, even though both of you are speeding (or above the limit by maybe 15 or more KPH)? Hmmm...

An on duty police officer (regardless if it is a marked or unmarked car) does NOT have to adhere to the posted speed limit.

Meaning, a cop is doing 140 in a posted 100 zone. You decide to follow and they pull you over. Yes, they can ticket you. And no, going to court and saying 'well the officer was going just as fast' won't get you out of a ticket.

[Shaner]

An on duty police officer (regardless if it is a marked or unmarked car) does NOT have to adhere to the posted speed limit.

Meaning, a cop is doing 140 in a posted 100 zone. You decide to follow and they pull you over. Yes, they can ticket you. And no, going to court and saying 'well the officer was going just as fast' won't get you out of a ticket.

haha Anyone who uses that excuse in court is an idiot and deserves to have their fine doubled for stupidity.
Cops can speed for any reason related to the duties of their job, not just if they are responding to a call.

[EH100501AC]

Or if you go at the same speed as a cruiser, even though both of you are speeding (or above the limit by maybe 15 or more KPH)? Hmmm...

Kinda ironic isn't it? They should be setting an example for the rest of us but everyone tends to slow down and simply follow behind the cruiser but still going speed limit. It really is up to the officer to pull you over even if you are or were following him/her over the speed limit.

[ShadowVlican]

yea..... comes down to whether they're a BIG jacka$$ or small jacka$$ that day

[EH100501AC]

yea..... comes down to whether they're a BIG jacka$$ or small jacka$$ that day

True. hehe They're still "jackarses" just whether if they're a big one or small one. Just remember to keep a distance though. If they're going a little over the limit, I like to follow them at the same speed but I'll give them a little bit of a head start :P

[ch1zo]

i would say more than 50% of cops break the law...

i see them all the time abusing their power...speeding, using their sirens just to pass a red light then turning it off right after...talking on the phone on the hwy....cutting people off without signaling...and the ironic part about all of this is they get away with it.

i wish cops could get tickets too:evil:

[rabblerouser]

I'm not even sure if these exist.. but they seem very feasible. Radar guns that connect the car's spedometer to display either the relative velocity of the vehicle ahead, or add the vehicle's relative velocity to that of the cruiser's to show the car's speed. It would be interesting if cruiser's were equipped with these...

Yes. they have had genesis II directional units for a looooong long time

[rf134a]

An on duty police officer (regardless if it is a marked or unmarked car) does NOT have to adhere to the posted speed limit.

Meaning, a cop is doing 140 in a posted 100 zone. You decide to follow and they pull you over. Yes, they can ticket you. And no, going to court and saying 'well the officer was going just as fast' won't get you out of a ticket.

OPP must follow different rules than the rest of the country because that's illegal and against the rules of conduct. Going above the speed limit requires the use of lights but sirens are optional.

Doppler radar (K/KA-band) has been in use by the Mounties for years.
http://en.wikipedia.org/wiki/Doppler_radar

[evolution921]

Talking about following the speed of a cruiser, I notice that if the police cruiser goes 45km/h in a 60 zone on a normal sunny day, 80% of the cars behind the cruiser would travel at the same speed as the cruiser.

[ch1zo]

Talking about following the speed of a cruiser, I notice that if the police cruiser goes 45km/h in a 60 zone on a normal sunny day, 80% of the cars behind the cruiser would travel at the same speed as the cruiser.

yeah i hate when that happens...what the heck is everyone so scared of??
if you didnt do anything why are u affraid?
i hate when people follow the police especially if they are going way under the speed limit.

[Shaner]

OPP must follow different rules than the rest of the country because that's illegal and against the rules of conduct. Going above the speed limit requires the use of lights but sirens are optional.

Doppler radar (K/KA-band) has been in use by the Mounties for years.
http://en.wikipedia.org/wiki/Doppler_radar

The OPP does not have different rules than any other police service. They all fall under the Criminal Code of Canada and the Police Services Act.

Also, to my knowledge, there is absolutely no policy or law anywhere stating a cop must use lights when travelling above the speed limit. I'm fairly confident that you are mistaken, because a lot of cops intentionally don't use their lights due to the risk it creates. Other cars see the lights and all of a sudden find themselves in a daze, especially cars coming towards the cruiser. It's fairly common for oncoming traffic to drift into the cruisers lane when the officer is driving with his lights on.
So unless absolutely needed, a lot of cops will keep the lights and sirens off.