Considering city road environment as the background. by researching GPSR greedy algorithm and the movement characteristics of vehicle nodes in VANET. this paper proposes the concept of circle changing trends angle in vehicle speed fluctuation curve and the movement domain and designs an SWF routing algorithm based on the vehicle speed point forecasted and the changing trends time comp... https://www.ealisboa.com/mega-grab-Samsung-Galaxy-S21-5G-8GB-Ram-128GB-Unlocked-SM-G991UZWAXAA-special-buy/