Your cited data does a good job for me. An average of 885 lbs with 345 lbs coming directly from safety & emissions equipment equipment ( 39% ) and additional equipment that is, in part, necessary to support that equipment (e.g. beefier suspension to hold up the added weight, and more breaking power to stop the addition weight). Easily puts the weight contribution of safety equipment (as defined in your citations) and >=50%
The secondary weight (additional engine, suspension, brakes, to make up for the feature) is proportional to the addition, you can't add it separately for some features yet count it against only the weight of other features. In other words, the secondary weight is (according to the study) 80%. If you add that 80% on to the 345 (276), you also have to add it the remaining 540 (432). So safety features plus secondary weight is 621 out of 1593. Still 39%.
You have a jumble of numbers there that I was working with, none of which exist in the article quoted near them (or any other article):
http://web.mit.edu/sloan-auto-lab/research/beforeh2/files/MacKenzie%20Zoepf%20Heywood%20Car%20Weight%20Trends%20-%20IJVD.pdf
Can you explain where your numbers are coming from, and to be clear, this is the block of your text I am talking about:
"According to one study, in the average modern car (compared to the average in 1975) has an additional 246lbs due to safety equipment, 99lbs for emmissions, and 540lbs because of optional comfort and convenience equipment (this includes "secondary" weight increases from needing more power, brakes, and suspension)."
page 10
"In total, features were estimated to add a total of 109 kg (240 lbs) to the
average 1975 passenger car. In 2010, the estimated contribution grows to 223 kg
(62 kg safety, 25 kg emissions, 136 kg comfort/convenience; a total of 491 lbs).
These estimates do not include the contribution of secondary weight, discussed in
the following section."
I converted kg to lbs...
"Secondary weight represents the notion that for every unit of weight added to
(or removed from) a vehicle, the supporting systems and structures also grow
(or shrink) so that structural integrity and braking, acceleration and handling
performance can be maintained. Typically, the secondary weight is expressed as
some percentage an initial (primary) weight change...
For
the purposes of this study the secondary weight was assumed to be 80% of the
primary weight added"
Then added 80%
The specific numbers don't even matter. You could have taken the main point from the pictograph I attached (taken from the same study): the majority of weight increases has been comfort and convenience items, not safety and emissions as you kept claiming.
The NHTSA consider a safety issue worthy of recall.
There have been no fleetwide recalls of vehicles with manual steering or 2WD.
...killing people because the ignitions turned off causing loss of power steering assist leading to loss of control?
There is an enormous difference between having a car which has a manual steering gear installed from the factory and having the power steering pump fail on a power steering car. A manual gear has a different gear ratio which makes it significantly easier to turn. Since with power steering the engine is doing most of the work of turning the wheels, they make the gear ratio smaller so you don't have to turn the wheel as many times to go from full right to full left. Furthermore, when a power steering system is in place, but not running, the driver has to not only move the wheels, they also have to overcome the resistance of the pump itself, forcing the power steering fluid back through it. In other words, its is significantly harder to turn the wheel on a power steering system currently not engaged than it is to turn a manual steering gear.
I know this automotive theory, but I've also switched multiple vehicles from power steering to manual, and actually driven them with full power steering, with power steering installed but not active, with a power steering gear but fluid and pump removed, and with a manual gear installed.
Probably even more relevant is that in the GM case vehicles were
suddenly and unexpectedly making this switch from easy to turn wheel to very difficult to turn wheel, which is far more of a control issue than the actual force it takes.
In other words, have you had your head in a hole the last two years?
Why do you feel it helps your argument to throw in random personal attacks?
The biggest cause of accidents on the road that aren't related to driver distraction are related to a driver's inability to control a vehicle.
citation?
Power steering assist is something that significantly improves a driver's ability to maintain control over a vehicle
citation?
If these two things are true, then there will be a significantly significant correlation between vehicles with manual steering and accident rates.
-- particularly but not limited to situations where quick maneuvers are necessary at relatively low speeds (like, for example, in heavy city traffic).
Relatively low speeds are unlikely to require quick maneuvers, because of the low speeds involved. In the event of an accident, speed is the single largest factor of impact severity, and at low speeds serious injury or death are unlikely.
I can detail the physics for you of the benefits of AWD, if you'd like. Or would that just be a waste of my time?
I'd be more interested in the statistics showing that all AWD vehicles have significantly lower crash rates than all 2WD. The physics would indicate that ABS makes cars safer, but the statistics say in reality it doesn't.
All of this is so beside the point!
Clearly you kept saying "mostly safety and emissions" because you want to blame "big government" for bad things (grr, regulations!)
Now that I found actual data that says otherwise you are looking for any technicalities to try to justify the original claim, even though it was based on political ideology to begin with.
Cars are inefficient because American consumers want big powerful cars with power everything.
If you disagree, explain why Europe has higher emissions and safety requirements (with correspondingly lower emissions and lower fatality rates in accidents), yet has smaller, lighter, more fuel efficient vehicles.