Possible Clues:

• Like highway traffic markers
• Section of company that's mostly agreeable
• Section, perhaps, dealing with traffic barriers?
• Pointed to study piece at regular intervals
• Like certain parlor containers
• Shaped like a megaphone
• ___ sections (ellipses, parabolas and hyperbolas)
• Shaped like a dunce’s cap
• *Extremely famous
• Rounded and pointed