Route marker installation height What is the standard top height of a route marker measured above the road crown level in highway signing practice?

Introduction / Context:
Route markers (route number shields/plates) are small regulatory signs placed at frequent intervals to aid wayfinding. Mounting height influences visibility, safety, and maintenance.

Given Data / Assumptions:

• Height is measured from road crown level to the top edge of the sign.
• Two-lane undivided road context; pedestrian conflict minimal.

Concept / Approach:
Standard practice sets a modest mounting height to keep route markers visible to drivers without creating excessive wind load or pole height. Around 2.0 m is widely adopted for small markers in rural and peri-urban roads.

Step-by-Step Solution:

Verification / Alternative check:
Many sign installation guides specify 2.0 m to the top or 1.8–2.1 m envelope depending on verge conditions; larger regulatory or informatory signs often require higher mounting heights.

Why Other Options Are Wrong:
1.50–1.75 m may be low for visibility and can be obstructed; 2.25 m is more typical for larger signs and urban pedestrian areas.

Common Pitfalls:
Confusing route markers with large guide signs; measuring height from shoulder instead of crown.

Final Answer:
2.00 m