The FDOT says that a driver’s speed can be influenced by a number of factors. These can include the speed they have traveled at for the previous five or 10 miles, the time of day, the purpose of the trip, pavement type and condition, and ambient light.
Other factors, such as shoulder width and condition, the familiarity of the driver with the road, pavement roughness, the condition of vehicle, adjacent land use and development, and the urgency of trip can also affect the driver’s speed.
Finally, additional factors that can impact a driver’s speed are traffic volume, the driver’s emotional state, the lane width, the driver’s experience, the speed of other drivers, the weather, and the presence of law enforcement.