TY  - JOUR
PY  - 2018//
TI  - What characterizes a vehicle as follower on two-lane intercity highways under heterogeneous traffic conditions
JO  - Journal of transportation engineering, Part A: Systems
A1  - Boora, Amardeep
A1  - Ghosh, Indrajit
A1  - Chandra, Satish
SP  - e04017070
EP  - e04017070
VL  - 144
IS  - 2
N2  - The presence of a high proportion of vehicles in the following condition indicates that a particular roadway facility is performing poorly. Due to lack of related standard guidelines, planners and engineers in India use the same definition presented in U.S. Highway Capacity Manual regarding following vehicles, which may not be appropriate because of the heterogeneity in Indian traffic conditions. After performing graphical analysis, it was concluded that the previously used methodologies cannot be used for the present study because it could mislead the final findings. Hence, a new method was introduced to identify following vehicles in which speed difference (SD) and gap threshold value are used instead of the headway between two consecutive vehicles. It was found that after a cut-off gap threshold of 10 s, all the vehicles, irrespective of their categories, started traveling in the nonfollowing condition. A SD limit of −4 to +10km/h was used to identify the following vehicles below the cut-off gap threshold value of 10 s. By using the acceptance curve method, different cut-off gap values ranging from 1.9 to 4.4 s were observed at all study sites, beyond which probability of not following (PNF) increased. After validation of the results, two-way traffic volume was identified as the dominating parameter that affects the cut-off gap value.<p />  <p>Language: en</p>
LA  - en
SN  - 2473-2907
UR  - http://dx.doi.org/10.1061/JTEPBS.0000106
ID  - ref1
ER  -