English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The design of a mountain expressway includes many special road sections, such as the combination of sharp bends and curved slopes, which may easily cause traffic accidents. Speed limit is an effective means of ensuring the safety of travellers. A novel speed limit formulation method was proposed in this study to improve the scientific level of the speed limit standard of a mountain expressway. First, the model of vehicle driving stability in the critical state of side rollover and sideslip was established. Second, the stabilities of vehicle side rollover and sideslip on the horizontal curve and slope curve were analyzed by considering the influence of vehicle dynamic characteristics. Finally, a specific speed limit implementation scheme for a multi-curve road section was proposed with an example. Results demonstrate that when the curvature radius of the road is large, the critical speed of vehicle side rollover and sideslip is high. In particular, the critical speed of vehicle side rollover is high when the gradient value of the transverse slope of the road section is considerable within a limited range. Meanwhile, the critical speed of vehicle sideslip is high when the frictional resistance coefficient of the pavement is high. The gradient value of the longitudinal slope of the curved slope section slightly affects the critical speed of vehicle rollover and sideslip. This study provides a strong theoretical basis for setting a safe driving speed limit in curve road sections.

Speed Limit Safety of Expressway Curves Based on the Critical State Evaluation Model of Vehicle Side Rollover