Basic Vehicle Motion Analysis: A Modern Accident Reconstruction Guide

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The basic strategy of a Safe System approach is to ensure that in the event of a crash, the impact energies remain below the threshold likely to produce either death or serious injury. This threshold will vary from crash scenario to crash scenario, depending upon the level of protection offered to the road users involved.


As sustainable solutions for all classes of road safety have not been identified, particularly low-traffic rural and remote roads, a hierarchy of control should be applied, similar to classifications used to improve occupational safety and health. At the highest level is sustainable prevention of serious injury and death crashes, with sustainable requiring all key result areas to be considered.

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At the second level is real-time risk reduction, which involves providing users at severe risk with a specific warning to enable them to take mitigating action. The third level is about reducing the crash risk which involves applying the road-design standards and guidelines such as from AASHTO , improving driver behavior and enforcement. Traffic safety has been studied as a science for more than 75 years.

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Road traffic crashes are one of the world's largest public health and injury prevention problems. The problem is all the more acute because the victims are overwhelmingly healthy before their crashes.

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The contrecoup-coup phenomenon: a new understanding of the mechanism of closed head injury. This is the final indicator a pathologist can look at to estimate the time of death. For example; Car Crash WebQuest Introduction. They document the recovery of artifacts evidence , such as human remains, weapons, and other buried items, that may be relevant to the criminal event. The program will outline the basic steps that should be followed when conducting internal investigations of misconduct by department personnel and will focus on procedural issues.

According to the World Health Organization WHO , more than 1 million people are killed on the world's roads each year. The report also noted that the problem was most severe in developing countries and that simple prevention measures could halve the number of deaths.

The standard measures used in assessing road safety interventions are fatalities and killed or seriously injured KSI rates, usually per billion 10 9 passenger kilometres.

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Countries caught in the old road safety paradigm, [6] replace KSI rates with crash rates — for example, crashes per million vehicle miles. Vehicle speed within the human tolerances for avoiding serious injury and death is a key goal of modern road design because impact speed affects the severity of injury to both occupants and pedestrians.

Injuries are caused by sudden, severe acceleration or deceleration ; this is difficult to measure. However, crash reconstruction techniques can estimate vehicle speeds before a crash.

Level Two — Accidental Characteristics

Therefore, the change in speed is used as a surrogate for acceleration. This enabled the Swedish Road Administration to identify the KSI risk curves using actual crash reconstruction data which led to the human tolerances for serious injury and death referenced above. Interventions are generally much easier to identify in the modern road safety paradigm, whose focus is on the human tolerances for serious injury and death. For example, the elimination of head-on KSI crashes simply required the installation of an appropriate median crash barrier.

Also, roundabouts, often with speed reducing approaches, encounter very few KSI crashes. The old road safety paradigm of purely crash risk is a far more complex matter. Contributing factors to highway crashes may be related to the driver such as driver error, illness, or fatigue , the vehicle brake, steering, or throttle failures , or the road itself lack of sight distance, poor roadside clear zones, etc.

Interventions may seek to reduce or compensate for these factors, or reduce the severity of crashes. A comprehensive outline of interventions areas can be seen in management systems for road safety. Study conducted in Finland revealed that the fatality risk is increased most when a collision type is either pedestrian or meeting of the vehicles. In addition to management systems, which apply predominantly to networks in built-up areas, another class of interventions relates to the design of roadway networks for new districts.

Such interventions explore the configurations of a network that will inherently reduce the probability of collisions.

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Interventions for the prevention of road traffic injuries are often evaluated; the Cochrane Library has published a wide variety of reviews of interventions for the prevention of road traffic injuries. Most injuries occur on urban streets but most fatalities on rural roads, while motorways are the safest in relation to distance traveled.

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The autobahn fatality rate of 1. Traffic accident data are often compared between countries and between regions. These comparisons are done in numbers of casualties, but also in relation to the number of inhabitants a measure of national health risk , the number of vehicle kilometres driven a measure of the transport risk as well as the number of cars in a country, etc. For a reliable comparison the real volumes should be used rather than recorded numbers with different recording rates [12].

On neighborhood roads where many vulnerable road users, such as pedestrians and bicyclists can be found, traffic calming can be a tool for road safety. Though not strictly a traffic calming measure, mini-traffic circles implanted in normal intersections of neighbourhood streets have been shown to reduce collisions at intersections dramatically [18] see picture. Shared space schemes, which rely on human instincts and interactions, such as eye contact , for their effectiveness, and are characterised by the removal of traditional traffic signals and signs , and even by the removal of the distinction between carriageway roadway and footway sidewalk , are also becoming increasingly popular.

Both approaches can be shown to be effective. For planned neighbourhoods, studies recommend new network configurations, such as the Fused Grid or 3-Way Offset. These layout models organize a neighbourhood area as a zone of no cut-through traffic by means of loops or dead-end streets.

They also ensure that pedestrians and bicycles have a distinct advantage by introducing exclusive shortcuts by path connections through blocks and parks. Such a principle of organization is referred to as "Filtered Permeability" implying a preferential treatment of active modes of transport. These new patterns, which are recommended for laying out neighbourhoods, are based on analyses of collision data of large regional districts and over extended periods.

Modern safety barriers are designed to absorb impact energy and minimize the risk to the occupants of cars and bystanders. For example, most side rails are now anchored to the ground, so that they cannot skewer a passenger compartment. Most light poles are designed to break at the base rather than violently stop a car that hits them. Some road fixtures such as signs and fire hydrants are designed to collapse on impact. Safety barriers can provide some combination of physical protection and visual protection depending on their environment. Physical protection is important for protecting sensitive building and pedestrian areas.

Visual protection is necessary to alert drivers to changes in road patterns. Most roads are cambered crowned , that is, made so that they have rounded surfaces, to reduce standing water and ice, primarily to prevent frost damage but also increasing traction in poor weather. Some sections of road are now surfaced with porous bitumen to enhance drainage; this is particularly done on bends.

These are just a few elements of highway engineering. As well as that, there are often grooves cut into the surface of cement highways to channel water away, and rumble strips at the edges of highways to rouse inattentive drivers with the loud noise they make when driven over. In some cases, there are raised markers between lanes to reinforce the lane boundaries; these are often reflective.

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In pedestrian areas, speed bumps are often placed to slow cars, preventing them from going too fast near pedestrians. Poor road surfaces can lead to safety problems. If too much asphalt or bituminous binder is used in asphalt concrete, the binder can 'bleed' or flush' to the surface, leaving a very smooth surface that provides little traction when wet. Certain kinds of stone aggregate become very smooth or polished under the constant wearing action of vehicle tyres, again leading to poor wet-weather traction.

Either of these problems can increase wet-weather crashes by increasing braking distances or contributing to loss of control. If the pavement is insufficiently sloped or poorly drained, standing water on the surface can also lead to wet-weather crashes due to hydroplaning. Lane markers in some countries and states are marked with cat's eyes , Botts' dots or reflective raised pavement markers that do not fade like paint. Botts dots are not used where it is icy in the winter, because frost and snowplows can break the glue that holds them to the road, although they can be embedded in short, shallow trenches carved in the roadway, as is done in the mountainous regions of California.

Road hazards and intersections in some areas are now usually marked several times, roughly five, twenty, and sixty seconds in advance so that drivers are less likely to attempt violent manoeuvres.

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Basic Vehicle Motion Analysis: A Modern Accident Reconstruction Guide - Kindle edition by David N. Dresser. Download it once and read it on your Kindle. Basic Vehicle Motion Analysis: A Modern Accident Reconstruction Guide [David N. Dresser] on *FREE* shipping on qualifying offers. This text.

Most road signs and pavement marking materials are retro-reflective , incorporating small glass spheres [24] or prisms to more efficiently reflect light from vehicle headlights back to the driver's eyes. Turning across traffic i.

1. Introduction

The more serious risk is a collision with oncoming traffic. Since this is nearly a head-on collision, injuries are common.

Chapter 10: Forensic Sciences

It is the most common cause of fatalities in a built-up area. Another major risk is involvement in a rear-end collision while waiting for a gap in oncoming traffic. There is no presumption of negligence which arises from the bare fact of a collision at an intersection, [27] and circumstances may dictate that a left turn is safer than to turn right.

Turns across traffic have been shown to be problematic for older drivers.