Examples of underside in a Sentence the underside of the table The book explores the underside of human nature. First Known Use of undersidein the meaning defined at sense 1. Learn More about underside. Time Traveler for underside The first known use of underside was in See more words from the same year. Dictionary Entries near underside undershot wheel undershrub undershrubby underside under siege undersign undersigned See More Nearby Entries.
More Definitions for underside. English Language Learners Definition of underside. Kids Definition of underside. Comments on underside What made you want to look up underside? Get Word of the Day daily email! Test Your Vocabulary. Love words? Need even more definitions? Low chassis vehicle means a trailer or semitrailer having a chassis that extends behind the rearmost point of the rearmost tires and a lower rear surface that meets the configuration requirements of S5.
Outer or Outboard means away from the trailer centerline and toward the side extremities of the trailer. Pulpwood trailer means a trailer that is designed exclusively for harvesting logs or pulpwood and constructed with a skeletal frame with no means for attachment of a solid bed, body, or container. Rear extremity means the rearmost point on a vehicle that is above a horizontal plane located mm above the ground and below a horizontal plane located 1, mm above the ground when the vehicle is configured as specified in S5.
Nonstructural protrusions such as taillights, rubber bumpers, hinges and latches are excluded from the determination of the rearmost point. Road construction controlled horizontal discharge trailer means a trailer or semitrailer that is equipped with a mechanical drive and a conveyor to deliver asphalt and other road building materials, in a controlled horizontal Underide, into a lay down machine or paving equipment for road construction and paving operations.
Underide corner means a guard's outermost end that curves upward or forward toward the front of the vehicle, or both. Side extremity means the outermost point on a vehicle's side that is located above a horizontal plane mm above the ground, below a horizontal plane located cm above the ground, and between a transverse vertical plane tangent to the rear extremity of the vehicle and a transverse vertical plane located mm forward of that plane when the vehicle is configured as specified in S5.
Non-structural protrusions such as taillights, hinges, rubber bumpers, and latches are excluded from the determination of the outermost point. Special purpose vehicle means a trailer or semitrailer that:. When their headlights illuminate the trailer, on-coming drivers will only be to feet away, and unable to stop at higher speeds.
Additional Underride Factors Additional factors can contribute to cause side underride collisions. The most obvious factor being inoperative or dirty lights on the trailer's side. As an approaching driver's eyes adapt to the bright lights, a "blackhole" in the nearby unlit road is created. This makes it very difficult for a driver to see any trailer, whether it is lighted or not.
When operating near these brightly lighted areas, it is not uncommon for truck drivers to assume their trucks are more visible. However, it is more likely that the trucks are less visible than they would be in an area not adjacent to very bright lights. A similar situation can occur when a driver leaves a very bright area and enters an area with little or no light. Under this circumstance, called dark adaptationdrivers will have difficulty seeing dark objects, such as a semi trailer, until their eyes adapt to the change in light intensity.
A very slow-moving truck can also contribute to cause a side underride collision, Underide. Obviously, a slow-moving truck will take more time to cross the road, making it a hazard for a longer period of time. Additionally, a slow-moving truck that creates less contrast than a faster moving truck, will be hard to perceive as an obstruction. At low speeds, the side-marker lights will appear to remain stationary. As a result, an approaching driver Underide most likely perceive these lights as distant taillights or roadside markings.
Another situation that contributes to cause a side underride collision occurs when a truck is making a left turn or backing across traffic. Typically, when a truck with a trailer enters a road making a left turn or when it backs across traffic, the tractor will be centered in the one travel lane while the trailer is blocking oncoming traffic in the opposing lane.
With the tractor's headlights pointed directly at oncoming traffic, the dark trailer will be less visible since the drivers' eyes will be adapting to the headlights. Also, oncoming drivers will generally perceive the truck only as an approaching vehicle in the opposing lane, not one blocking their path.
If the Underide from the tractor are bright, the approaching driver will not only have light adaptation problems, but also may do as most people are taught and look away using the white pavement edgeline to navigate. If this happens, the approaching driver will most likely never see the trailer in his lane.
Rear Underride Collisions Rear underride collisionswhen a passenger vehicle runs under the rear of a straight truck or semi-trailer, are also a major problem.
In addition to the normal rear-end collision circumstances, an underride will typically result from a poorly-marked truck or trailer that is either parked on the side of the road, moving slowly as it enters the road, slowing to exit the road, or slowing for a railroad crossing.
Additional contributors that can cause rear underride are: inoperative, dirty, or dim taillights; taillights placed very close together; a failure to properly use reflective triangles when parked or broken down on or near the road; and a failure to use emergency flashers when entering or exiting the highway at slow speeds. Trucks often take a long time to accelerate or slow down when entering or exiting roads. Passenger-vehicle drivers on highways with speed limits ranging from 55 mph to 75 mph typically do not expect to meet a truck traveling at 10 mph.
Not only is this lack of driver expectancy a problem, but also a driver has difficulty in accurately determining distance and closing speed at night. Closing speed is usually determined by a subconscious comparison of an object to its background and by the rate at which the object gets larger. At night, the background around an object is usually all black, which makes the size of a faraway object and the rate at which it gets larger very difficult to determine accurately.
When Underide another vehicle, the distance between an approaching vehicle's headlights or the distance between a followed vehicle's taillights and how high they appear to be is what the brain uses to try to determine how far away that vehicle is. The rate at which the lights move farther apart is how closing speed is determined. One problem that drivers have in processing this information is that the distance between the lights and their mounting height is different on each type of vehicle.
The most striking example of different light separation distances is the difference between a standard semi-trailer, which has taillights that are about 8 feet apart, and a bobtail tractor, which has taillights that are about 2 feet apart. If these two vehicles were the same distance from an observer at night, the observer would subconsciously assume that the bobtail tractor was farther away. This distance judgment problem becomes very apparent when a driver meets a vehicle with only one headlight or taillight that is illuminated and he struggles to determine how far away, and how quickly that vehicle is approaching.
Not uncommon is for drivers to be startled at night when they realize that the vehicle in front of them is much closer and moving much slower than they had perceived. When this dilemma happens, the primary factor that determines if a collision will occur is the difference in speed between the two vehicles.
If the following vehicle is traveling much faster than the lead vehicle, the following vehicle driver may not have enough time to react once he realizes the vehicle in front of him is traveling very slowly.
Underride Extrication. Published. 5 years ago. on. Aug 2, By. Mike Smith. Heavy Vehicle Extrication is often personnel and equipment intensive. A great example, rescue companies from Lower Macungie Fire Department, Goodwill Fire Company No.1 of Trexlertown, PA-Station 25 and Alburtis Fire Department worked for about an hour to free. Research into truck underride guard performance. Current research into underride guard performance is focused on providing greater understanding of the characteristics of underride events and contributing factors, as well as providing next steps towards defining a computer model to evaluate underride guard designs and vehicle impacts. Another word for underside. Find more ways to say underside, along with related words, antonyms and example phrases at frasvesivimetse.skodarligeburmantpovazmirapabe.co, the world's most trusted free thesaurus. Jul 10, · Underride collisions occur when a smaller vehicle slides underneath a large tractor-trailer. It is one of the most deadly types of accidents. They are frequently fatal accident because the vehicle sliding under the truck is typically crushed by the weight of the truck on impact. Underride guards don’t fully protect the truck’s rear end. There are spots on either side of the guard that remain unprotected, therefore leaving a great chance of an underride accident. Cars don’t always hit a truck right in the middle of the trailer. Oftentimes they try . Underide Lyrics: Overdrawn / In need of cash / Not a job in sight / Let's rob this goddamn bank, you know / The next thing I know / We had eleven people sprawled out on the black and white tiled. The UnderDeck Ceiling System turns the space under your deck into a clean and enjoyable haven without costly reconstruction. Read about the materials you'll need and view installation instructions to maximize your deck's potential. Truck underride collisions can be deadly to passenger-vehicle occupants, even at low speeds. An underride occurs when a passenger vehicle collides with a straight truck or the trailer of a truck-tractor semi-trailer combination (truck) and runs under the truck, sometimes sheering the roof off the vehicle and killing the occupants. Underlie definition is - to lie or be situated under. How to use underlie in a sentence. underride guards, relative to the guards in use prior to model year , in terms of preventing fatalities and serious injuries. Using the Fatality Analysis Reporting System (FARS), it was not possible to determine a reduction in passenger vehicle fatalities. The model year of the trailer is not recorded in FARS, thus no precise analysis can be.
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