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Speed camera leeway in Canberra?

By jeckle - 15 August 2010 40

Hi All,

I’m quite new to Canberra and am constantly coming across the much debated issued of the amount of roadworks and speed changes in and around Canberra. Driving around I seem to spend most of my time checking the speedo and looking for the latest sign.

While I’m slowly adjusting and learning my way around, I’m wondering what the speed camera leeway is in the ACT? I’ve been searching everywhere for this information or just an indication, but nothing as yet.

Any suggestions welcome.

Cheers

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40 Responses to
Speed camera leeway in Canberra?
Special G 7:01 pm 15 Aug 10

Why is it people always seem to want to know – How much can I speed before I get booked? How about try not speeding for a change.

Thoroughly Smashed 5:58 pm 15 Aug 10

NeedHelp said :

The 10% is correct, but for obvious reasons, it’s not advertised. I went out of my way to find out when I was clocked at 88kph in an 80. The tolerance level was 87. Missed it by THAT much.

First and last ticket in about 15 years.

Being fined for 88 in an 80 zone doesn’t actually prove the threshold is 87.

MrNurseRatchet 5:44 pm 15 Aug 10

I can speak from experience as I’ve recently moved here as well: if you’re going 68 in a 60, they will get you. It’s 1 pt. and ~$150.00. Apparently the cops here don’t excuse a “momentary lapse in judgement.” 😀 Oh well. Lesson learnt: don’t speed in Canberra.

NeedHelp 4:43 pm 15 Aug 10

The 10% is correct, but for obvious reasons, it’s not advertised. I went out of my way to find out when I was clocked at 88kph in an 80. The tolerance level was 87. Missed it by THAT much.

First and last ticket in about 15 years.

cranky 4:30 pm 15 Aug 10

DavidL,

As a tyre wears, the diameter decreases. For each revolution of the drive train, as read by the speedometer, the vehicle travels a lesser distance.

The actual speed is increasingly lower than the indicated speed.

steveu 4:01 pm 15 Aug 10

Australian Design Rules for speedometers in motor vehicles show the variation.

Tooks 3:56 pm 15 Aug 10

DavidL5N96 said :

Whilst we are on this topic, when are the police going to charge P platers who have the P plate on the front and not the rear (speed photos are of the rear of the car – and that makes me laugh when I see someone slow down before the camera and start speeding up when passing through)

Surely you don’t want P platers being sent to court for missing a P plate! A $99 infringement notice should be enough to teach them a lesson.

bd84 3:31 pm 15 Aug 10

Speed camera vans are not used in road works zones, you will occasionally find the police will though patrol them.

Having said that, most speed camera vans are visible for quite a distance ahead, if you’re paying full attention to the road you normally have time to slow slightly if you’re like most people travelling slightly above the speed limit. If you’re travelling well above that’s when you will normally get caught.

liability 3:17 pm 15 Aug 10

Don’t know about the ACT but NSW was 10% plus 1 when I was involved in it a few years ago, I doubt if it would have changed.

10% was the allowed variable for speedometers to comply with Australian Design Rules, and I understand that was why that figure was used, i.e. some speedos can technically read 10% slow and still be within the specs of the ADR, this could mean that your speedo shows 60 when you are actually doing 66. So, the 10% plus 1 was used so that you should only get a ticket if your speedo is showing that you are speeding [assuming that it is within ADR specs].

One other thing to remember is that changing wheel size can have a big impact on the accuracy of your speedo.

DavidL5N96 2:52 pm 15 Aug 10

deye is spot on – using the highway speed checks outside Melbourne and Albury over a period of time (and numerous checks), I had one car which read 94kph when doing 100, another car which read 105 when doing 100. Nowadays my GPS (which I treat as not being trustworthy) gives reasonable confirmation of my previous readings. Note that apart from your speedo the diameter of your tyres has an effect as the tread wears down – you are going faster with a smaller diameter – I will leave it to the experts to work out if this is important.

If you thought that the leeway is 10% you are going to get booked. There is some leeway but not much. Sigh, knowing more than most drivers what my real speed is I get frustrated when people go at a speed 5-10 kmh less than allowed.

Whilst we are on this topic, when are the police going to charge P platers who have the P plate on the front and not the rear (speed photos are of the rear of the car – and that makes me laugh when I see someone slow down before the camera and start speeding up when passing through)

Sgt.Bungers 2:12 pm 15 Aug 10

I have heard from a fairly reliable source that the leeway in NSW for fixed cameras is 10% + 1. ACT probably has something similar, but don’t quote me on that.

Your best bet is to assume your speedo under-reads by 10%, and the speed camera over reads by 2km/h. Travel past them all at a few k’s under and you’ll be fine.

deye 1:58 pm 15 Aug 10

astrojax said :

why should there be a leeway?

because there is very little that is 100% accurate including your speedo and the cameras

Me no fry 1:56 pm 15 Aug 10

What’s the leeway? I know, anecdotally, a few of the speed values that it isn’t – but that’s not answering your question.

As a newcomer to Canberra you’d be well advised, when considering your speed, not to take any cues from the road and surrounding environment, otherwise you may find yourself doing, for example, 110 in an 80 zone, or worse, 80 in a 60 zone.

You’d also be well advised to stick to roadwork speed limits not only because you will occasionally see police enforcing these, but because some of the roadworks are a bit tricky to negotiate and the route through the roadworks can change.

But there has to be some sort of leeway. There are so many variable factors affecting a car’s true speed that seemingly small factors like tyre wear and the inflation level of tyres can affect the speed by 2 to 3%.

astrojax 1:09 pm 15 Aug 10

why should there be a leeway? the posted limit s the maximum speed, in good conditions, at which you should drive on the stretch of road to which it applies – why should you want to do more?

Rawhide Kid No 2 11:55 am 15 Aug 10

Officially None

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