NCJ Number
92132
Journal
International Criminal Police Review Issue: 361 Dated: (October 1982) Pages: 216-228
Date Published
1982
Length
13 pages
Annotation
This article explains the structure of vehicular light bulbs and describes the theory and practice for determining whether vehicular light bulbs were burning when an accident occurred.
Abstract
The changes that occur in incandescent lamps in normal use are described, as are the alternative effects that can result when incandescent lamps are subjected to impact (accidents). The article concludes that a chart can be compiled on the basis of the considerations discussed, such that an investigator can reach one of the following conclusions in the majority of cases: the lights were on; the lights were off; the bulb was defective before the accident; and laboratory examination is required to determine the bulb's condition at the time of the accident. The study demonstrates that a single item of evidence cannot provide an adequate basis for a definite conclusion as to whether the vehicle lights were on or off before the accident. A logical analysis of all the available evidence is considered necessary. Since preservation of the lamp bulbs after the accident is important for subsequent investigations, recommendations are offered for ensuring this preservation. The chart for solving simple cases is provided, and 60 bibliographic entries are provided.