This article reviews the history of the development of a grade severity rating model, the implementation of the current Grade Severity Rating System (GSRS), and the ongoing research efforts to select and simulator test signs to identify the most effective sign for transmitting weight-specific speed information to truck drivers.
A new concept in traffic control devices is evaluated. The subject of the study is a special message information sign on US-14A near Burgess Junction, Wyoming. The sign presents motorists with percent and length of grade information in response to a long sustained 10 percent downgrade. This diagrammatic sign is located in a turnout. Vehicles such as tractor semitrailers, single-unit trucks, motor homes, and vehicles pulling trailers are required to turn out and read the sign. This method for presenting complex information to motorists is effective and the compliance with the required turnout is high.
We prove that groups acting geometrically on delta-quasiconvex spaces contain no essential Baumslag-Solitar quotients as subgroups. This implies that they are translation discrete, meaning that the translation numbers of their nontorsion elements are bounded away from zero.