Fig. 9: Changes in the travel speed and emission factor distribution.
From: Estimating emissions reductions with carpooling and vehicle dispatching in ridesourcing mobility

Due to traffic congestion, ride-hailing vehicles experience variations in their driving speeds throughout the day. A speed of ~60 km/h is considered the optimal balance point, as it allows for maximum reduction in fuel consumption while effectively minimizing pollutant emissions. a Real-time travel speed distribution, b Emission factor changes with different travel speeds.