Research Article
Speed Behavior of Passenger Car on Helical Ramps and Helical Bridges in Mountain Riverside City
Table 1
Main technical parameters of the test objects.
| Test object name | Location | (km/h) | Traffic lane number | Travel direction | Structural form | G (%) | Horizontal Radius (m) | Number of layers | Test vehicles | Participant identification number |
| Yangtze River Bridge (YZ) | Fuling District, Chongqing | 20 | 1 | one-way | Single column pier | 4.5% | 39.525 m for ascending ramp, 50 m for descending ramp | 2 | Buick GL8 Firstland, Buick Buddha | D6–D15 |
| Wujiang Bridge (WJ) | Fuling District, Chongqing | 30 | 2 | one-way | Single pier continuous cantilever beam | 4.5% | 51 m for ascending ramp, 38.25 m for descending ramp | 2 | Buick GL8 Firstland, Buick Buddha | D6–D13 |
| Rongqiao Helix Bridge (RQ) | Urban area of Chongqing | 40 | 2 | one-way | Door-type multi-span continuous beam | 6% | Median strip radius 55 m | 2 | Benz Vito, Toyota Hiace, Buick Buddha | D1–D5; D10–D11; D13–D15 |
| Jinkai Ring Bridge (JK) | Fuling District, Chongqing | 20 | 2 | two-way | Door-type multi-span continuous beam | 5–6% | 30 m (centerline) | 2 | Buick Buddha | D8–D15 |
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: design speed; : gradient of the ramp. |