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20/09/2016
Nearly took one for the team on Sunday. Red light/speed camera on Warrigal Road and Batesford Road Chadstone.
Phew. That had me worried. As I was posting the video for the red light camera/speed camera on the corner of Warrigal Road and Batesford Road Chadstone I was reminded the light changed to amber as I was driving through. At the time I didn't give it a second thought as I most likely felt I was sufficiently close to the intersection that stopping wasn't safe or practical, which it wasn't. However reviewing the video made me get quite concerned. Had I been booked!!!
Watching the video you can see I was nearly across the intersection when the traffic light turns red. Anyone would consider that to be OK and it happens to us all the time. But how close was I to getting booked. A lot closer than I would have ever thought. I think once you read this you'll realise the government has tightened down their tolerance so there is very little margin for error and a lot of margin for revenue generation. OK. That's a tad cynical.
Here's a link to the video. Play the video at normal speed and ask yourself what you would have done. Stopped or gone through. (https://youtu.be/E2c36V6c5OM)
Based on the video I travelled 1.33 seconds until I reached the white line. I measured this later and that means I was around 2 metres before the line. When we look out the front windows of a car we can't see the exact front of the car. We estimate.
Now what is generally not known is where the sensors are placed. They are not at the white line where you stop your car. The induction loops can be placed quite a bit further forward. Using Google maps I measured this to be 3.44 metres.
Why is this important? We've all grown up believing if your car has entered the intersection you're OK. It is even stated on the Victoria Police site (http://www.police.vic.gov.au/content.asp?document_id=40417), "A road safety red light camera is activated when a vehicle crosses the stop line and enters the intersection after the light/arrow turns red. If a vehicle is already partially or wholly over the stop line and within the intersection when the light/arrow turns red, an infringement will not be issued. All images are verified before an infringement notice is issued."
The police don't get a picture of where you were when the light changes to red. Only when the rear of your car leaves the sensor. Two pictures are taken. A second picture is taken a second later. We just have to hope when the pictures are reviewed they get it right.
There's one more little piece of detail. Speedometers by law have to be at or below the actual speed limit and can be up to 10% lower. That means if you're at the speed limit, you're most likely travelling slower than the speed limit. When I'm travelling at100 km/h the highway test shows around 96 km/h. At 40 km/h I'd guess I'd be travelling at perhaps 38 km/h. However since I was approaching the light I made sure I was under the 40 km/h, so perhaps another 2 km/h. That means I may have been travelling at about 36 km/h
So how close was I to getting booked?
It took 1.33 seconds to get to the white line according to the video. At 36 km/h that's 10 metres. There's then actually 2 metres between my car and the white line. So I was roughly 12 metres to the line.
My car is 4.7 m long and the distance to the end of the sensor 3.44 m. That's another 7.14 m. A total distance of 19.14 metres.
At 36 km/h the stopping distance assuming and emergency reaction time of 1.5 seconds, is 22 m, so no time for me to stop. safely. OK. I did the right thing.
The amber light goes for 3 seconds. At the 36 km/h I would travel 30 m. I had close to 11 m to spare. I'd suggest that's about one car length plus the spacing between cars.
In reality I had about a second to spare. There's also 0.5 seconds after the red light changes where reportedly you don't bet booked. A total of 1.5 seconds.
It really isn't a lot. The 1.5 seconds is assumed for an emergency driving situation and in a relaxed driving situation I don't think we react that fast and certainly don't come to a stop as fast. In addition you don't just look at the lights. You look at the traffic around you, from the sides, your speedometer. and any other potential hazards. There's a lot going on and the difference between getting fined or not is very slim.
Had I been going less than 30 km/h, then it gets very, very close. I suspect this is a reason for many people getting booked by red light cameras and speed cameras when turning and when in low 40 km/h speed zones. Great for government revenue.
This really is a reminder that when travelling on a low speed road (40 km/h), or turning at an intersection, where often the amber timing is set at the much shorter 3 seconds than for the speed limit of the road, if the amber light comes on, try to stop if it safe to do so. There's no tolerance for going through a red light and it is very costly.
Kelvin Eldridge
www.speedcameralocations.com.au
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