Traffic control elements on a carriageway: the subsidiary area constructed within the paved area to channelize and regulate vehicle movement is called

Introduction / Context:
Channelization improves intersection safety and efficiency by guiding vehicles along intended paths. Special paved areas are constructed within the carriageway to separate conflicts and organize traffic flows.

Given Data / Assumptions:

• We are naming a subsidiary area formed within the carriageway.
• Purpose: control and guide vehicle movements.
• Options include various roadside or median features.

Concept / Approach:
An island is a designated area (raised or flush) used to direct traffic, separate movements, and provide pedestrian protection at intersections or merges. It differs from medians (which separate opposing streams along a roadway segment) and from purely aesthetic features.

Step-by-Step Solution:

Verification / Alternative check:
Design manuals classify channelizing, divisional, and pedestrian protection islands; the core function is traffic control within the carriageway.

Why Other Options Are Wrong:
Median strip separates opposing traffic along segments, not specifically for channelization at conflict points; flower bed is aesthetic, not a traffic device; a refuge refers specifically to pedestrian safety space and is a type of island but not the general term.

Common Pitfalls:
Using “median” generically; ignoring that many refuges are a subset of islands.

Final Answer:
island