In this study, four test
scenarios are established to analyze drivers′ deceleration behavior at tunnel entrances during daytime free-flow conditions and quantitatively evaluate the regulating effects
of different visual guiding facilities. The scenarios include: Scenario 1
(control group with industry standards), Scenario 2 (2.5 m elevation marker), Scenario 3 (circular elevation marker), and
Scenario 4 (multi-level visual guiding system). The
deceleration start position, changes in deceleration rate, and throttle opening
rate are used as analytical indices. The test results show the following: (1)
Drivers′ speed patterns generally follow a stable-declining to relatively stable trend. (2) In Scenario 1, drivers
began decelerating later, which lead to a more abrupt deceleration and a
shorter deceleration stage, resulting in less driving comfort and higher
control risk compared to other scenarios. (3) Scenarios 2 and 3 allow drivers
to identify the tunnel portal earlier, thereby extending the driving comfort zone.
(4) Scenario 4 performs the best, with the deceleration starting position 65%
ahead of that in Scenario 1, and the driving comfort zone extends by 13.1%
compared to Scenario 1. Furthermore, Scenario 4 achieves the highest average
throttle opening (0.095) and the lowest throttle control risk (0.13), making it
the most suitable deceleration mode for tunnel entrance areas. The test results
demonstrate that using circular elevation markers at tunnel and a multi-level visual guiding system at tunnel entrances helps drivers detect
the entrance earlier, start decelerating sooner, and decelerate slowly. This
significantly improves driving safety and comfort in tunnel entrance areas.
QIANG Weijie
,
CHEN Guojun
,
DU Zhigang
,
CHEN Weifeng
,
YU Liang
,
BEI Runzhao
. Experimental Study of
Deceleration Behavior in Expressway Tunnel
Entrance With Different Visual Guiding Systems[J]. Tunnel Construction, 2024
, 44(9)
: 1863
-1873
.
DOI: 10.3973/j.issn.2096-4498.2024.09.015
