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Green Book turning templates

Green Book turning templates

Green Book turning templates

It is my understanding that the turning templates in the AASHTO Green Book assume that the vehicle is starting the turn with it's wheels already turned to max angle. This doesn't seem to be a realistic condition. The turning path of the vehicle will be affected by the time it takes the driver to turn the steering wheel. Is my understanding of the templates incorrect?
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RE: Green Book turning templates

I had not heard that before. A quick review of some sources of the templates shows them starting the turn with the steering axle straight ahead (see http://image.slideserve.com/259312/aashto-turning-...).

RE: Green Book turning templates

I believe you're correct; the templates as drawn have an immediate transition from tangent to radial at the point of curvature. To mimic real life, there should be some distance (time) for the driver to crank the steering wheel, unless vehicle is at a dead stop before turning. These templates are for low speed maneuvers, and the small transition from straight wheels to full turn not shown is probably not significant.

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