Zebra crossings

I felt sure it must show that I was no longer a virgin. When a car overtook me as I pedaled home, I thought the driver must see how different I was. There was a zebra crossing on Loampit... 

Rear-end shunts account for 15% of accidents. Shunt and lane changing accidents increase on link sections with zebra crossings. 

Pelican and zebra crossings sited dose to the roundabout do not necessarily cause accident problems. 

Paradoxical effects of marked pedestrian crossings. Interestingly, the ubiquitous marking of crosswalks by two lines or zebra crossing - the most common pedestrian safety device - does not seem to be an effective accident countermeasure, and may even be counterproductive. This is despite the fact that drivers are more likely to yield to pedestrians in marked and conspicuous crosswalks than when they cross the street in unmarked or less conspicuous crossings (Katz et a ., 1975 Shinar, 2000 Van Houten, 1992). 

Reported Road Casualties Great Britain Annual Report 2013 (DfT, 2014) has a table showing pedestrian casualties for different types of crossing. The table shows that eight people were killed at zebra crossings while 22 were killed at light-controlled crossings. 

Does this mean that zebra crossings are much safer than signal-controlled crossings Or are they equally safe but that there are more signal-controlled crossings than zebra crossings Or are zebra crossings safer because they are usually located in lower-speed, lower-traffic-volume roads Without further information it is not possible to draw any firm conclusions from these raw data. 

Zebra crossings have a total collision rate of 0.6/year per site (on or within 50 m of... 

The molar entropy corresponds to the change of entropy required by the addition of a small amount of the component in order to keep the temperature constant at a given pressure, extrapolated linearly to 1 mol. Statements of this type can make things difficult at first, but actually come up a lot in everyday life. An example when a car traveling at 50 km/h crosses some zebra stripes, it might take 1 s to do so. If we linearly extrapolate the width of the stripes by a factor of 3,600, we obtain a distance of 50 km. That s the meaning of traveling at 50 km/h. ... 

To minimize the errors inherent in the use of large normalization factors, the basic cross-section file employed should be adjusted. Ihe procedure for doing this has been well worked out by Rowlands and others, but the data now available om the phitonium-fueled ZPR s (ndien added to the data from ZEBRA, SNEAK, etc.) should make it possible to arrive at a much more reliable set of adjusted cross sections. 

Use of ZEBRA-8 Analysis for Validating the Critical Experiment Cross-Section Processing Technique, P, t. Choong, A. K, Hartman (GE, Sunnyvale)... 

The ZEBRA-8 series of null-zone measurements featured a different neutron spectrum for each assembly. The series covers a range of spectra both harder and softer than that of the LMFBR and also emphasizes different structural/ diluent materials. The experimental data base was ideal for validating the cross-section processing technique because the experimental results had been reduced to simulating the infinite medium, and uncertainties in the extrapolation have been included. The homogeneous compositions for each assembly are shown in Table I. 

The relatively large spread of calculation-to-experiment (C/E) results for ZEBRA-8 kee -( l-3%) is indicative of the need for a better cross-section library. Iq particular, the low value of 0.958 for ZEBRA-8C suggested that iron resonance capture was too high. For the important 28C/49F ratio, the C/E results are in excellent agreement with VIM s. However, they are several percent lower than normally observed in ZPR and ZPPR analysis. ... 

The diversity of material composition and resulting s -tra coupled with the simplicity of ansdysis geometry made ZEBRA-8 very useful for rapid validation of cross-section library and processing techniques. It is highly recommended... 

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