Horizontal Alignment Security Design Theory and Application of Superhighways

Abstract

In China, the maximum design speed of highways is 120 km/h, which first appeared in the Highway Engineering Technical Standard (Trial) in 1951. However, vehicle performance, road design, and construction technology have been greatly improved over the past 68 years. To adapt to the development demands of highway design speeds above 120 km/h in the future, it is urgent to study superhighway alignment design theory. Therefore, the horizontal alignment security design theory of superhighways was developed in this paper. First, the definition, classification, and construction mode of a superhighway and suitable vehicles of different grades are presented. Then, the lengths of straight lines were limited to reduce driving fatigue. Next, the minimum radii of circular curves were calculated based on driver characteristics and stress analysis of operating vehicles. Finally, the minimum lengths of transition curves were calculated based on the centrifugal acceleration of the operating vehicles, the travel time, and the passenger visual characteristics. The calculation and analysis results show that the superhighway linear features conform to the vehicle operating characteristics, and can ensure the safety of driving.

The Link Road Design of Jalan Plupuh Tanon And Jalan Gabugan Section 1, Sragen Indonesia

“…For changeable curvature, the radius of the running track line also varies, shifting from infinity to a constant value, causing the line to change from a straight line to a circular arc. As long as the use is appropriate for each element and is well designed, then it can meet the driving requirements, besides there are no consistent restrictions to limit the number and frequency of use of such elements when building public roads (Pei, He, Ran, Kang, & Song, 2020).…”

Impact of Autonomous Vehicles on the Physical Infrastructure: Changes and Challenges

“…As a result, when a straight line is used, it must not be too long. Thus, previous studies show that, at speeds higher than 60 km/h, the maximum straight-line length should not allow the vehicle to travel more than 70 s on the design speed, which is equivalent to '20 × V' (design speed) [61]. Thus, the human driver is the main factor for adding the limitation on the maximum straight sections.…”

Study on a Prediction Model of Superhighway Fuel Consumption Based on the Test of Easy Car Platform

“…In the same year, to demonstrate the safety alignment of superhighways, our research team studied the design theory of plane alignment, vertical alignment and cross-section alignment of superhighways based on the linear design theory of ordinary superhighways and the linear design of railways. Calculations and analysis showed that the safety of superhighways can be guaranteed by means of adopting plane curves with a large radius and relatively gentle longitudinal slope [7].…”

“…According to the above calculation formula, the model equation of model J can be obtained as follows: F = 10 −5 v 3 + 0.005v 2 − 0.432v + 17.478 (7) Similarly, through curve fitting in the same way, the R-squared values of the cubic curve models of the other 4 models can be obtained. The R-squared values of model Z, model G, model H and model I are 0.975, 0.997, 0.998 and 0.984, respectively.…”