Enginerd
Member
Is there an easy way to know if this X had front collision warning (FCW) & automatic emergency braking (AEB)?
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Also confusing is that the arrows in the turn lanes suggest a sharp 90º turn rather than the actual 30º turn.
That intersection is a SPUI (single-point urban exchange), a relatively new intersection design. It's confusing for those people who have never seen one. It has the advantage in that it moves traffic faster that a typical freeway/cross street intersection that has to use two traffic lights on either side of the freeway. The SPUI reduces the intersection to a single traffic light.
Right. Deceleration is the same from collision of two cars of equal mass at equal speed as with one car crashing into an immovable object like a concrete freeway bridge pillar. At 75 mph a car is traveling 110 ft/sec, so assuming a 6 ft crumple zone, the car stops in 6/110 = 0.054 seconds.
They are there: View attachment 237077
The only thing I've seen is that they "didn't seem" life threatening.
...Consider the option of using a second set of Wrong-Way and Do Not Enter signs, and wrong-way arrows further along the off-ramp. The option of using additional signs and markings on selected ramps may give drivers a second chance to realize that they are headed the wrong way before they enter the freeway. Update: CA MUTCD Section 2B.41 permits the use of additional WRONG WAY signs and pavement arrows where a ramp intersects a crossroad in such a manner that a wrong-way entry could inadvertently be made. Caltrans has employed using two sets of WRONG WAY and DO NOT ENTER signs on each side of exit ramps as a countermeasure to further reduce wrong-way collisions...
...“During the late 1960's, the Division of Highways installed red-backed retroreflective pavement markers on all lane lines on freeways. These proved to be of limited value. The red-backed retroreflective markers are now used only in the vicinity of off-ramps as a secondary treatment. “In 1965, the Division of Highways installed parking lot spike barriers to determine if they could be used on off-ramps to physically stop vehicles from entering the wrong way. Unfortunately, these devices were found to be unsuitable for the following reasons: the spikes, even when modified with a fishhook-like shape, would not cause tires to deflate quickly enough to prevent a vehicle from entering the freeway the wrong way; under high-volume traffic the spikes broke off leaving stubs that damaged the tires of right-way vehicles; and some right-way drivers, upon seeing the spike barriers, would apply their brakes. Also, camera surveillance of off-ramps indicated that most wrong-way drivers quickly realized that they were entering the freeway going the wrong-way, and took corrective action; the spike barriers prevented that corrective action. “The state of Georgia tested a pop-up device that presented a physical curb-like barrier to the wrong-way driver, but it was unsuitable for reasons similar to those of the spike barriers. A recent poll of all 50 states revealed that none has found a suitable physical barrier to prevent wrong-way drivers from entering off ramps. Most states use a wrong-way package similar to California's. “California tried adding horns and flashing red lights over the "WRONG WAY" signs in the 1970's, but these were found to be ineffective, and they drew complaints from neighbors. 12 | Page “In the mid-1970's, wrong-way packages were upgraded and other improvements were made in signing, delineation, lighting, and ramp design at all on-ramps and off-ramps. Automatic cameras were used to record wrong-way entries. The cameras were in place for a minimum of 30 days at each of the 4,000 off-ramps across the State. The camera surveillance indicated that, through various improvements, wrong-way entries were reduced to low levels at 90 percent of the ramps with previous entry problems. These improvements have been incorporated into Caltrans’ current standard procedures. “One device that was tested did show promise. Red, airport-type pavement lights, embedded in the pavement across an off-ramp, when activated by wrong-way vehicles, were shown by camera monitoring to further reduce wrong-way entries. However, Caltrans has completed its evaluation of the red, airport-type pavement lights as recommended and has ceased using them due to significant maintenance and reliability issues....
head on crash and the X amazingly stays in tact. hate seeing this but I'm glad i have an X for my family.
View attachment 236868
later stories reveal that there were several near misses and folks calling in prior to the Collision. If logic has any rule here, your average sober moron immediately stops once the mistake has been made, doesn't just keep rolling on down the road. bottom line is you can reconfigure a road as difficult as possible & put up as many flashing expensive red signs as possible. that is, if that's how the State of Arizona wants to spend taxpayer dollars. I'd be delighted to see any other state or country that goes to such crazy lengths.Also confusing is that the arrows in the turn lanes suggest a sharp 90º turn rather than the actual 30º turn.
"I saw nothing. All of a sudden my X slammed on its brakes as it sounded an alarm, and then the crash."