IIHS Sharply Criticizes Automakers over Front-End Designs in New Report

[grbeck]

17 hours ago, rperez817 said:

 

That's related to a civil engineering guideline for traffic control called 85th percentile speed. IIHS described this concept, including its limitations, on the same webpage I shared earlier in the thread.

 

 

 

Also, IIHS provided the following information comparing speeding vs. speed variation.

 

 

 

Of course travel speeds are increasing on highways. Vehicles are increasingly quieter and less prone to rattle or vibrate. I learned to drive on a 1973 AMC Gremlin. In that car 55 mph felt like 80 mph. Our current vehicles can cruise effortlessly all day at 85 mph. That's perfectly safe on an uncrowded limited access highway, so of course people will drive at those speeds. 

[akirby]

This is why you should be skeptical of data especially when it’s being used to support a particular viewpoint or agenda.  This is a simple math error but you also have to watch out for cherry picking and using the wrong or incomplete data.

 

This is one of the studies used by the IIHS.  It looked at injury rates before and after a speed limit change in Seattle.  Note the last column which attempts to show the difference in the 2 percentages.

Look at the middle row - downtown Seattle.  It claims there was a 10.8% reduction.  That’s a lie.  The reduction was actually 1.2% (11.6->10.4).  You can’t take percentages of percentages.

 

The bigger flaw is that almost all injury crashes will say speed is a factor regardless of whether speed caused the accident or caused the injuries.  E.g. a person going the speed limit who drifts off the road and rolls their vehicle not wearing a seatbelt, gets ejected and dies.  It will list speed as a factor but it’s not a root cause of either the accident or the injuries.

 

These studies also don’t factor in weather or traffic.  When a road becomes congested speeds drop and so should injuries and fatalities even though accidents might go up.  If one study period had 500 rainy days and the other period had 200 then that’s not a valid comparison.  Too many factors and not enough data to make good correlations on cause.

 

[rperez817]

17 hours ago, rperez817 said:

speed management measures

 

Earlier this week, National Transportation Safety Board (NTSB) recommended a requirement for Intelligence Speed Assistance technology in all new cars. NTSB Calls for Technology to Reduce Speeding in All New Cars

 

Intelligent speed assistance technology, or ISA, uses a car’s GPS location compared with a database of posted speed limits and its onboard cameras to help ensure safe and legal speeds. Passive ISA systems warn a driver when the vehicle exceeds the speed limit through visual, sound, or haptic alerts, and the driver is responsible for slowing the car. Active systems include mechanisms that make it more difficult, but not impossible, to increase the speed of a vehicle above the posted speed limit and those that electronically limit the speed of the vehicle to fully prevent drivers from exceeding the speed limit.

 

Previous NTSB recommendations to address the problem of speeding include the following.

 

Regulators should:

• Develop performance standards for advanced speed-limiting technology, such as variable speed limiters and intelligent speed adaptation devices, for heavy vehicles, including trucks, buses, and motorcoaches. Then require that all newly manufactured heavy vehicles be equipped with such devices.
• Collaborate with traffic safety stakeholders to develop and implement an ongoing program to increase public awareness of speeding as a national traffic safety issue.
• Revise regulations to strengthen requirements for all speed engineering studies and remove the guidance that speed limits in speed zones be within 5 mph of the 85th percentile speed.
• Update speed enforcement guidelines to reflect the latest automated speed enforcement technologies and operating practices and promote these guidelines.

States should:

• Amend current laws to authorize state and local agencies to use automated speed enforcement and amend current laws to remove operational and location restrictions on the use of automated speed enforcement.

Drivers should:

• Follow the speed limit.
• Slow down during bad weather, when a road is under repair, in poorly lit areas at night, or in other challenging driving conditions.

[Deanh]

45 minutes ago, rperez817 said:

 

Earlier this week, National Transportation Safety Board (NTSB) recommended a requirement for Intelligence Speed Assistance technology in all new cars. NTSB Calls for Technology to Reduce Speeding in All New Cars

 

 

 

 

Previous NTSB recommendations to address the problem of speeding include the following.

 

Regulators should:

• Develop performance standards for advanced speed-limiting technology, such as variable speed limiters and intelligent speed adaptation devices, for heavy vehicles, including trucks, buses, and motorcoaches. Then require that all newly manufactured heavy vehicles be equipped with such devices.
• Collaborate with traffic safety stakeholders to develop and implement an ongoing program to increase public awareness of speeding as a national traffic safety issue.
• Revise regulations to strengthen requirements for all speed engineering studies and remove the guidance that speed limits in speed zones be within 5 mph of the 85th percentile speed.
• Update speed enforcement guidelines to reflect the latest automated speed enforcement technologies and operating practices and promote these guidelines.

States should:

• Amend current laws to authorize state and local agencies to use automated speed enforcement and amend current laws to remove operational and location restrictions on the use of automated speed enforcement.

Drivers should:

• Follow the speed limit.
• Slow down during bad weather, when a road is under repair, in poorly lit areas at night, or in other challenging driving conditions.

classic...how about using f'in common sense.....but thx for trhe advice NTSB.

Drivers should:

• Follow the speed limit.
• Slow down during bad weather, when a road is under repair, in poorly lit areas at night, or in other challenging driving conditions.

[ice-capades]

2 hours ago, rperez817 said:

Earlier this week, National Transportation Safety Board (NTSB) recommended a requirement for Intelligence Speed Assistance technology in all new cars. NTSB Calls for Technology to Reduce Speeding in All New Cars

 

Previous NTSB recommendations to address the problem of speeding include the following.

 

Regulators should:

• Develop performance standards for advanced speed-limiting technology, such as variable speed limiters and intelligent speed adaptation devices, for heavy vehicles, including trucks, buses, and motorcoaches. Then require that all newly manufactured heavy vehicles be equipped with such devices.
• Collaborate with traffic safety stakeholders to develop and implement an ongoing program to increase public awareness of speeding as a national traffic safety issue.
• Revise regulations to strengthen requirements for all speed engineering studies and remove the guidance that speed limits in speed zones be within 5 mph of the 85th percentile speed.
• Update speed enforcement guidelines to reflect the latest automated speed enforcement technologies and operating practices and promote these guidelines.

States should:

• Amend current laws to authorize state and local agencies to use automated speed enforcement and amend current laws to remove operational and location restrictions on the use of automated speed enforcement.

Drivers should:

• Follow the speed limit.
• Slow down during bad weather, when a road is under repair, in poorly lit areas at night, or in other challenging driving conditions.

 

Caution! "Big Brother" wants more power to monitor our behavior, location, etc. and automate compliance, enforcement and penalties.

 

[Chrisgb]

3 hours ago, akirby said:

This is why you should be skeptical of data especially when it’s being used to support a particular viewpoint or agenda.  This is a simple math error but you also have to watch out for cherry picking and using the wrong or incomplete data.

 

This is one of the studies used by the IIHS.  It looked at injury rates before and after a speed limit change in Seattle.  Note the last column which attempts to show the difference in the 2 percentages.

Look at the middle row - downtown Seattle.  It claims there was a 10.8% reduction.  That’s a lie.  The reduction was actually 1.2% (11.6->10.4).  You can’t take percentages of percentages.

 

The bigger flaw is that almost all injury crashes will say speed is a factor regardless of whether speed caused the accident or caused the injuries.  E.g. a person going the speed limit who drifts off the road and rolls their vehicle not wearing a seatbelt, gets ejected and dies.  It will list speed as a factor but it’s not a root cause of either the accident or the injuries.

 

These studies also don’t factor in weather or traffic.  When a road becomes congested speeds drop and so should injuries and fatalities even though accidents might go up.  If one study period had 500 rainy days and the other period had 200 then that’s not a valid comparison.  Too many factors and not enough data to make good correlations on cause.

 

Stopping kills, not speed.

[rmc523]

3 hours ago, Chrisgb said:

Stopping kills, not speed.

 

Solution - All accelerator, all the time.

[Deanh]

22 hours ago, ice-capades said:

 

Caution! "Big Brother" wants more power to monitor our behavior, location, etc. and automate compliance, enforcement and penalties.

 

Not tomention the capacity to literally switch your car off....

[silvrsvt]

23 hours ago, Deanh said:

Not tomention the capacity to literally switch your car off....

 

Uh they can do that now if they really wanted to with newer ECUs in cars...sigh