Standard traffic cones available in various sizes. Highly flexible in terms of use for traffic control during project installation and/or as a barrier element for short-term demonstration projects. 

Typical Dimensions: Varied. Standard traffic cones are 36 inches or 48 inches high. 

Estimated Cost: $22/unit. See Sources.

Durability: Demo. 1 day to 1 month installation.

Bikeways Place along edge of bike lane every 8 - 20 ft. to create barrier, depending on the thoroughfare’s design speed / bikeway configuration.
Median Islands Place approximately 2 - 3 ft. apart to demarcate median area. Provide a minimum 6 ft. break for crosswalk/pedestrian accessibility.
Curb Extensions/Plazas Place along edge of plaza or curb extension, approximately 1 post every 8 - 10 ft.
Roundabouts May be placed every 2 - 3 ft. around the circumference to demarcate roundabout area, in conjunction with signs and other visual elements.

Re-usable, and easy to source but only appropriate for very short-term projects.
Easily knocked down — require monitoring when used as barrier element.
Opt for reflective cones for use during the evening or overnight.
Decorate cones with flowers, pinwheels, paint etc. to make your project more unique.

Borrow from city public works or transportation department
Buy / rent from traffic control equipment suppliers or construction companies.