Macski:
Also we have all driven regulary on roads were the lights are flashing away at lower speeds mile after mile yet there is nothing happening.
M62 drove me crazy for this, 40mph then 30mph for miles during the day and not a sole working on it until the night time.
Motorways and duel carriageways I just set the adaptive cruise control to whatever limit applies and sit there, patiently, thinking about the £20 per hour I’m on 
Zac_A:
TruckerGuy:
What’s the difference between 1.5 tons and 44 tons doing 40 MPH? 29.3.Spot on, but for those who don’t know how you got to that figure:
Formula is f=ma
First need to convert mph to metres per second
Results are in kg per m per second, also know as “Newton seconds”44,000 kg X 17.88 mps = 786,720
1,500 kg X 17.88 mps = 26,820786,720/26,820 = 29.3
Correct(ish), the difference is in the region of 760k, however it is kinetic energy that is the issue with regard to injury / death / outcome when a vehicle hits a human. Which is 0.5 mass times velocity squared. Add in other factors such as the ability of the recipient of the impact to avoid it?
With me so far? The reaction time for a human to a visual stimulus is about 0.25 seconds.
So, for the sake of debate at 0.0 seconds a workroadworksperson sees a threat of collision with them, 300 feet or 100 yards away. At 40 mph they have their reaction time (0.25 seconds) and then as the vehicle is travelling at 59 feet per second, well, then the workman has 4.9 seconds to get out of the way.
At 50 mph, 78.5 feet/second, the vehicle is 20 feet nearer by the time they react, and then they have only 3.6 seconds to get out of the way.
That doesn’t sound that much, however try to look at your watch and see how long a second is.
Just my opinion.
TruckerGuy:
GPS mandatory speed limiters are to be fitted to all new cars from next year.It’s a rubbish idea. Just limit the ultimate top speed to 70 MPH. There is no legal reason for anyone to go faster than 70 MPH.
Averaging speed cameras are a good idea because most idiots don’t know how they work. They brake like crazy to the speed limit to pass the camera, then continue speeding, unaware that it is the time between gates that is measured.
The fixed speed cameras are useless because people slow to pass them and they don’t get them. They just end up creating hard braking zones in the flow of traffic. Even people who are traveling at less than the speed limit brake “just because”.
All of them need their licences revoking.
What’s the difference between 1.5 tons and 44 tons doing 40 MPH? 29.3.
Whilst I can agree with most of your post, there are legitimate reasons (legal reasons) for exceeding the speed limit. Rare, but legal. As an example (ok a car driver example), in a 20 mph zone you overtake a driver doing 5 mph. accelerating to 30 mph as you do so, in order to complete the overtaking safely.
So, let us go to roadworks as that is the post. You in your truck in a 40 mph limit speed come across a truck doing 20 mph. Would you pull out and overtake at 40 mph or complete your overtake as quickly and safely as possible?
DGSA2:
TruckerGuy:
GPS mandatory speed limiters are to be fitted to all new cars from next year.It’s a rubbish idea. Just limit the ultimate top speed to 70 MPH. There is no legal reason for anyone to go faster than 70 MPH.
Averaging speed cameras are a good idea because most idiots don’t know how they work. They brake like crazy to the speed limit to pass the camera, then continue speeding, unaware that it is the time between gates that is measured.
The fixed speed cameras are useless because people slow to pass them and they don’t get them. They just end up creating hard braking zones in the flow of traffic. Even people who are traveling at less than the speed limit brake “just because”.
All of them need their licences revoking.
What’s the difference between 1.5 tons and 44 tons doing 40 MPH? 29.3.
Whilst I can agree with most of your post, there are legitimate reasons (legal reasons) for exceeding the speed limit. Rare, but legal. As an example (ok a car driver example), in a 20 mph zone you overtake a driver doing 5 mph. accelerating to 30 mph as you do so, in order to complete the overtaking safely.
So, let us go to roadworks as that is the post. You in your truck in a 40 mph limit speed come across a truck doing 20 mph. Would you pull out and overtake at 40 mph or complete your overtake as quickly and safely as possible?
You may think its legal but ultimately you will be reported to the cps and have to justify it all at court. Factor in missed days of work and the stress of it all maybe just stick to the limit and be stress free
Nearly there again:
You may think its legal but ultimately you will be reported to the cps and have to justify it all at court. Factor in missed days of work and the stress of it all maybe just stick to the limit and be stress free
Where do you think that I have given any legal advice? Again, just stick to the speed limit or indeed below. #notlegaladvice.
I am providing hypotheticals, scenarios, whereby anyone can be correct, and if you choose to ignore everything else I have posted on this. Well. That is your right. Nearly there again.
Why don’t you read my posts on this thread and form a view on what my view is before posting?
DGSA2:
[So, if it is 2 am and there are no workmen (or workwomen) about, or cameras then slow down, pay attention, If it is 2 am and there are flashing beacons slow down and pay attention.
I don’t understand.
Why would you slow down?
stu675:
DGSA2:
[So, if it is 2 am and there are no workmen (or workwomen) about, or cameras then slow down, pay attention, If it is 2 am and there are flashing beacons slow down and pay attention.
I don’t understand.
Why would you slow down?
Sigh, because that might give you or the roadworker an extra second to react before you kill someone.
See my posts above.
DGSA2:
stu675:
DGSA2:
[So, if it is 2 am and there are no workmen (or workwomen) about, or cameras then slow down, pay attention, If it is 2 am and there are flashing beacons slow down and pay attention.
I don’t understand.
Why would you slow down?Sigh, because that might give you or the roadworker an extra second to react before you kill someone.
See my posts above.
You stated that there were categorically NO workmen. Why would you need to give non-existent workmen more reaction time?
Thanks for the replies.Some of them are a bit complicated though.I just reduce speed to what it says,the easy way.
When speed limits are shown within a red circle, even though there are usually no workers visible, nor any traffic on the road apart from yourself in the small hours, I have found that the Camerer’s still work, therefore I slow down to the speed limit.
Places to go people to see. What’s it got to do with you?
DGSA2:
TruckerGuy:
GPS mandatory speed limiters are to be fitted to all new cars from next year.It’s a rubbish idea. Just limit the ultimate top speed to 70 MPH. There is no legal reason for anyone to go faster than 70 MPH.
Averaging speed cameras are a good idea because most idiots don’t know how they work. They brake like crazy to the speed limit to pass the camera, then continue speeding, unaware that it is the time between gates that is measured.
The fixed speed cameras are useless because people slow to pass them and they don’t get them. They just end up creating hard braking zones in the flow of traffic. Even people who are traveling at less than the speed limit brake “just because”.
All of them need their licences revoking.
What’s the difference between 1.5 tons and 44 tons doing 40 MPH? 29.3.
Whilst I can agree with most of your post, there are legitimate reasons (legal reasons) for exceeding the speed limit. Rare, but legal. As an example (ok a car driver example), in a 20 mph zone you overtake a driver doing 5 mph. accelerating to 30 mph as you do so, in order to complete the overtaking safely.
So, let us go to roadworks as that is the post. You in your truck in a 40 mph limit speed come across a truck doing 20 mph. Would you pull out and overtake at 40 mph or complete your overtake as quickly and safely as possible?
Darn sure I read in the highway Code that exceeding the speed limit to overtake was not permitted. Daft I agree, but there you go.
Sand Fisher:
DGSA2:
TruckerGuy:
GPS mandatory speed limiters are to be fitted to all new cars from next year.It’s a rubbish idea. Just limit the ultimate top speed to 70 MPH. There is no legal reason for anyone to go faster than 70 MPH.
Averaging speed cameras are a good idea because most idiots don’t know how they work. They brake like crazy to the speed limit to pass the camera, then continue speeding, unaware that it is the time between gates that is measured. [emoji38] [emoji38] [emoji38]
The fixed speed cameras are useless because people slow to pass them and they don’t get them. They just end up creating hard braking zones in the flow of traffic. Even people who are traveling at less than the speed limit brake “just because”.
All of them need their licences revoking.
What’s the difference between 1.5 tons and 44 tons doing 40 MPH? 29.3.
Whilst I can agree with most of your post, there are legitimate reasons (legal reasons) for exceeding the speed limit. Rare, but legal. As an example (ok a car driver example), in a 20 mph zone you overtake a driver doing 5 mph. accelerating to 30 mph as you do so, in order to complete the overtaking safely.
So, let us go to roadworks as that is the post. You in your truck in a 40 mph limit speed come across a truck doing 20 mph. Would you pull out and overtake at 40 mph or complete your overtake as quickly and safely as possible?
Darn sure I read in the highway Code that exceeding the speed limit to overtake was not permitted. Daft I agree, but there you go.
It’s also in my copy of the highway code [emoji15]
Also, next year is closer than you think. From May all new cars will need speed limiters to gain type approval. (So that’s new models launched - and existing models from 2024).
It really is reaching the point where the last car you will ever want in your lifetime is being made about now.
I think the car would have to be doing 225mph to have the same energy on impact
DGSA2:
Zac_A:
TruckerGuy:
What’s the difference between 1.5 tons and 44 tons doing 40 MPH? 29.3.Spot on, but for those who don’t know how you got to that figure:
Formula is f=ma
First need to convert mph to metres per second
Results are in kg per m per second, also know as “Newton seconds”44,000 kg X 17.88 mps = 786,720
1,500 kg X 17.88 mps = 26,820786,720/26,820 = 29.3
Correct(ish), the difference is in the region of 760k, however it is kinetic energy that is the issue with regard to injury / death / outcome when a vehicle hits a human. Which is 0.5 mass times velocity squared. Add in other factors such as the ability of the recipient of the impact to avoid it?
With me so far? The reaction time for a human to a visual stimulus is about 0.25 seconds.
So, for the sake of debate at 0.0 seconds a workroadworksperson sees a threat of collision with them, 300 feet or 100 yards away. At 40 mph they have their reaction time (0.25 seconds) and then as the vehicle is travelling at 59 feet per second, well, then the workman has 4.9 seconds to get out of the way.
At 50 mph, 78.5 feet/second, the vehicle is 20 feet nearer by the time they react, and then they have only 3.6 seconds to get out of the way.That doesn’t sound that much, however try to look at your watch and see how long a second is.
Just my opinion.
It really doesn’t much matter how much more kinetic energy the heavy vehicle has, since in the case of a collision with a free-standing pedestrian, the moving vehicle will still have almost the same kinetic energy after the collision. What is significant is the amount of kinetic energy that transfers to the pedestrian (and how quickly it does so). The main result of this blunt impact transfer of energy is to accelerate the various squidgy bits at different rates, which is what causes the damage.
Sent from my VOG-L09 using Tapatalk
Roymondo:
DGSA2:
Zac_A:
TruckerGuy:
What’s the difference between 1.5 tons and 44 tons doing 40 MPH? 29.3.Spot on, but for those who don’t know how you got to that figure:
Formula is f=ma
First need to convert mph to metres per second
Results are in kg per m per second, also know as “Newton seconds”44,000 kg X 17.88 mps = 786,720
1,500 kg X 17.88 mps = 26,820786,720/26,820 = 29.3
Correct(ish), the difference is in the region of 760k, however it is kinetic energy that is the issue with regard to injury / death / outcome when a vehicle hits a human. Which is 0.5 mass times velocity squared. Add in other factors such as the ability of the recipient of the impact to avoid it?
With me so far? The reaction time for a human to a visual stimulus is about 0.25 seconds.
So, for the sake of debate at 0.0 seconds a workroadworksperson sees a threat of collision with them, 300 feet or 100 yards away. At 40 mph they have their reaction time (0.25 seconds) and then as the vehicle is travelling at 59 feet per second, well, then the workman has 4.9 seconds to get out of the way.
At 50 mph, 78.5 feet/second, the vehicle is 20 feet nearer by the time they react, and then they have only 3.6 seconds to get out of the way.That doesn’t sound that much, however try to look at your watch and see how long a second is.
Just my opinion.
It really doesn’t much matter how much more kinetic energy the heavy vehicle has, since in the case of a collision with a free-standing pedestrian, the moving vehicle will still have almost the same kinetic energy after the collision. What is significant is the amount of kinetic energy that transfers to the pedestrian (and how quickly it does so). The main result of this blunt impact transfer of energy is to accelerate the various squidgy bits at different rates, which is what causes the damage.
Sent from my VOG-L09 using Tapatalk
Aren’t we really wanting to talk about momentum which has direction rather than KE which doesn’t.