Final answer:
To improve the visibility of flares for temporary traffic control, they should be elevated above ground level and used close together.
Step-by-step explanation:
In order to improve the visibility of flares for temporary traffic control, they should be elevated above ground level. This allows the flares to be more easily seen by drivers from a distance. Flares that are placed too low to the ground may obstruct the view of drivers and result in accidents. Additionally, flares should be used close together to provide a continuous line of visibility, guiding drivers effectively. Using flares in pairs may be an effective strategy in some cases, but using them close together is generally preferred for better visibility.