Information Volume Threshold for Graphical Variable Message Signs Based on Drivers’ Visual Cognition Behavior

Table 2

Typical examples of the sample size in previous studies.

Year	Sample size	Title	Author
2018	16	Representativity and univocity of traffic signs and their effect on trajectory movement in a driving-simulation task: regulatory signs	Vilchez [29]
2018	40	The effectiveness of eco-driving training for male professional and nonprofessional drivers	Wu et al. [30]
2019	24	Multivariate analysis of fuel consumption related to eco-driving: interaction of driving patterns and external factors	Lois et al. [31]
2019	23	A preliminary investigation into the impact of connected vehicle human-machine interface on driving behavior	Ahmed et al. [32]
2020	20	Assessment of the effectiveness of connected vehicle weather and work zone warnings in improving truck driver safety	Raddaoui et al. [33]
2020	35	Spatiotemporal characteristics of vehicle trajectories in a connected vehicle Environment—a case of an extra-long tunnel scenario	Chang et al. [34]
2021	32	Influence of the median opening length on driving behaviors in the crossover work zone—a driving simulation study	Difei et al. [35]
2022	45	Assessing the effect of long-automated driving operation, repeated take-over requests, and driver’s characteristics on commercial motor vehicle drivers’ driving behavior and reaction time in highly automated vehicles	Samani et al. [36]