Traffic management – purpose of one-way streets in congested cities One-way streets are commonly introduced because they:

Introduction / Context:
One-way street systems are a classic operational tool in congested urban grids. By eliminating opposing flows and many turning conflicts, they improve safety and performance.

Given Data / Assumptions:

• Dense urban network with signalized intersections.
• Conversion of some links to one-way operation.

Concept / Approach:
One-way operation simplifies intersection control, allows coordination of signals, and removes head-on conflicts. It often raises average speed and lowers delay without major capital works, making it cost-effective.

Step-by-Step Solution:
Fewer conflict points → improved safety.Simpler signal phasing → reduced delays.Unidirectional lanes → smoother flow, potentially higher safe speeds.

Verification / Alternative check:
Before–after studies typically show reductions in crashes and modest increases in corridor speeds after one-way conversion.

Why Other Options Are Wrong:
Each single option captures only part of the benefits; collectively they describe the purpose accurately.

Common Pitfalls:
Ignoring pedestrian and access impacts; one-way systems need careful network planning.

Final Answer:
all the above