Opinion 
 Blogs 
 Jeff Corbett 
 The speed buffer 

The speed buffer

The NSW Government is in the process of changing the steps of the various speeding offences, and the new low-level speeding range leads me to suspect that the speeding buffer all drivers enjoy may be withdrawn. Or, at least, that it may be reduced.

As I write in my column today, that buffer or tolerance is 10 per cent, and I've been told about that by two highway patrol chiefs. It's been mentioned to me since then that the buffer does not apply in school zones, although I don't know whether that is the case. On top of the 10 per cent, by the way, is an error allowance of 1kmh for a stationary speed-measuring device, fixed speed cameras among them, and 2kmh for mobile devices.

Now, the new low-level range to come into effect in about six months is one demerit point for exceeding the speed limit by up to and including 10kmh, as opposed to the current three points up to and including 15kmh. My point, then, is that if the buffer is retained this low-level speeding limit will not apply in speed zones of 80kmh and above. That's because in an 80 zone the buffer plus 1kmh margin of error is 89kmh and plus 2kmh margin of error is 90kmh, the latter matching exactly the upper speed of the low-level offence. In 90, 100 and 110 zones the low-level offence is history. Drivers exceeding the speed limit by more than the buffer plus error margin in these zones will go straight into the mid-level speeding bracket, three points thank you very much. Not that they'll get my sympathy, because I see the 10 per cent as generous.

It is 10 per cent because Australian Design Rules for speedos set, for cars made before July 2006, as acceptable a speedo variation of plus or minus 10 per cent of the actual speed. So driving at a speed within that tolerance may be driving to the government's own rules.

Of course fuddy duddy drivers dripping with sanctimony will decry the buffer, or they will until it goes and they're booked for doing 62kmh in a 60 zone.

Another reason for the buffer is that it allows traffic to travel at the speed limit, which traffic controllers and police encourage, without having to be obsessed with the speedo. It is true, too, that many speedos that meet Australian Design Rule requirements do not show increments of 1kmh.

So, should the 10 per cent buffer stay? And if you say not, please tell us if you're often the target of horn-blasting and abuse and why.

Print
Increase Text Size
Decrease Text Size

comments


Date: Newest first | Oldest first
The RAAF base at Williamtown are kind supporters of the Starlight Foundation and have generously hosted open days for families.It takes plenty of hard work,skill and knowledge by the fighter pilots to keep those jets in the sky.One F18 pilot recalled APEC,when George Bush was here, a Cessna plane which had left Bankstown airport was off course,flying in restricted air space and the RAAF were sent to investigate .The F18 pilot got the attention of the cessna pilot by firing flares from the jet's wing.He also said keeping up with a cessna when flying a F18 is no easy task.
Posted by chaff and oats, 4/03/2009 8:48:20 PM
Are you sure, chaff and oats, you have the right blog?
Posted by Jeff Corbett on 5/03/2009 8:55:39 AM
I thik Chaff and Oats has been on the speed - and perhaps not the type Jeff is referring to in todays column!
Posted by King Idiot, 5/03/2009 10:25:58 AM
I'm all for the buffer. For that exact reason you don't have to concentrate on your speedo the whole time you are driving. You can also overtake reasonably a car moving at or just below the speed limit without too much fear of being booked. Are you sure it is police policy to book people on the buffer principles Jeff? I know of people booked for exceeding the limit below that threshold. What is the right to defend a booking within these tolerances?
Posted by CB, 5/03/2009 10:34:38 AM
I don't know of the legal position, and it seems to be relevant that the Government professes ignorance of the buffer (while its ministers benefit from it, of course). I don't know anyone booked within the 10 per cent.
Posted by Jeff Corbett on 5/03/2009 10:54:32 AM
cb people booked below the buffer may have failed the 'attitude test'.
Posted by senior sergeant smith, 5/03/2009 12:03:45 PM
I was told by a police officer that all speed cameras have a 10% tollerance. I wouldn't go 88kmh in an 80 zone though just incase your own speedo is out.
Posted by Nafe, 5/03/2009 1:39:47 PM
Precisely 11 per cent according to my informants, Nafe, although for practical purposes the difference is zilch. I don't think I've ever had a car speedo that could distinguish between 88kmh and 89kmh. And when I go past a fixed speed camera I try to be right on the money, so to speak.
Posted by Jeff Corbett on 5/03/2009 1:48:03 PM
In terms of measuring instrument specs, I would have thought "10% tolerance" is a range of error around the point in question, which suggests 5% either way. In which case one would be well advised not to exceed 63 in a 60 zone. But I could be wrong on the terminology.
Posted by Chris, 5/03/2009 5:51:35 PM
It says plus or minus 10 per cent of the actual speed, Chris, and that's 10 per cent each way.
Posted by Jeff Corbett on 6/03/2009 9:07:05 AM
Actually I just thought of something else. If both the speedo and the camera have 10% errors of measurement, ie 5% either way, then these two error tolerances would have to be added together (I think) to give a total error of 10% either way when both are being used. So presto, 66 in a 60 zone would be all right after all. Hmm.
Posted by Chris, 5/03/2009 6:00:04 PM
After 3 or so years of a daily F3 run Newcastle-Sydney-Return, I can confidently state that you can do up to 124km/h on the F3 without being booked. Of course, when they changed the demerits system a few years ago and made it 3 points all the way up to 30km/h over the limit, I lost my incentive to stick within 15km/h and figured "in for a penny, in for a pound" and consistently sat on 129km/h in 100 or 110 zones (where appropriate). Skeed pills, just ask the RTA - speeding causes cancer, diabetes and male-pattern baldness. Soames Job said it so it must be true... Just try to forget that the 110km/h F3 is every bit as good as 130km/h autobahnen - right down to the wire rope median and breakdown lanes. PS: Jeff, the Europeans don't allow cyclists on motorways.
Posted by Scott Hillard, 5/03/2009 6:32:18 PM
Seems to me, Scott, that 129kmh is a dangerous speed on the F3. At that speed on the freeway I need all my wits, and you may well be able to summon yours more readily than I can, but the real problem are the drivers who are short on wits at 110kmh and less.
Posted by Jeff Corbett on 6/03/2009 9:10:04 AM
You'll also find that a lot of cars have a 5% buffer between the indicated speed and the actual speed. My lumbering behemoth does.
Posted by nowonmaii, 6/03/2009 7:29:10 AM
when you drive through an area where they are having road works sometimes there is a roadside sign that flashes up your speed at you. do you think that these signs would measure your speed the same as a speed camera and therefore motorists could use them to check how close their speedo registers their speed compared to a coppers speed registering devices?
Posted by chameleon, 6/03/2009 9:17:59 AM
1 | 2  |  next >
Jeff Corbett
Bend the online ear of the Hunter's most provocative columnist.

Most popular articles


 
Balance Health Club-Wests Tower
 
Landcom Sanctuary


Newcastle Herald







Weather brought to you by:

Weatherzone

Classifieds

Front Page

Current Issue
Privacy Policy | Conditions of Use | Advertising Terms | Copyright © 2012. Fairfax Media.
 SEND...
 SAVE...
 SHARE...