From the perspective of 19 urban agglomerations and comprehensive transportation between them, this study, selecting node cities as research units, defines both the narrow and generalized corridor accessibility to calculate the corridor accessibility coefficient by the weighted average travel time and investigates their overall pattern. The gravity model improved by comprehensive-time cost is used to calculate the economic subordination degrees between Lanzhou–Xining urban agglomeration and other urban agglomerations. Moreover, the differences in the spatial distribution of inter-provincial logistics connectivity between the individual and total amount in Gansu province are discussed, and then the unbalanced trend of spatial connection is analyzed. The results indicate that the horizontal gradient of accessibility of different regions in China has statistical differences and the time-space compression caused by the layout of main transportation lines in Gansu province presents a typical “corridor effect.” The inter-provincial logistics economic relations in Gansu province demonstrate significant stratification characteristics and an unbalanced “neighbor effect” while there are few provincial groups directly connecting with Gansu province. Finally, based on data analysis and logical deduction, the paper analyzes the current situation, discusses the existing shortcomings and strategic advantages of Gansu province, and tries to give development suggestions in terms of the current opportunities as well as responsibilities.

This study mainly investigates the maximum length of CAV (Connected and Autonomous Vehicle) platoons in a heterogeneous traffic flow environment. By employing MATLAB to simulate the heterogeneous traffic flow on expressways, this study focuses on the maximum platoon length of CAV platoons and explores their impact on the traffic flow characteristics on expressways. Firstly, based on four different car-following modes of heterogeneous traffic flow, F-STCA (Flexible–Symmetric Two-Lane Cellular Automata Model) and the symmetric lane-changing strategy, the study refines and improves the construction of the NaSch (Nagel and Schreckenberg) model introduced into the Gipps safety distance formula. The whole improvement process is based on the acceleration decay characteristics of vehicles on expressway. Secondly, the congestion situations under different maximum platoon lengths are compared using fundamental heat maps of the simulation data. The evolution of the fundamental diagram with changes in maximum platoon length is studied to investigate the impact and magnitude of maximum platoon lengths on the road capacity under different CAV permeabilities. Finally, the study explores the stability and safety of heterogeneous traffic flow involving CAV platoons using SD (Standard Deviation) and TERCRI (Time-Exposed Rear-End Collision Risk Index). The results show that when the CAV’s permeability does not reach a high level on heavily trafficked sections of the expressway, considering the overall average speed, the maximum platoon length should not be set too long and should be around five vehicles. This restriction does not apply when the CAV permeability approaches 100%.