Question 1

What is the difference between gantry and cantilever highway signs?

Accepted Answer

Gantry signs span across the entire carriageway on a portal frame, providing visibility to both directions simultaneously. Cantilever signs extend from a single roadside support and serve one direction. Gantries are preferred for high-speed expressways, while cantilevers are cost-effective for state highways.

Question 2

What reflective grade is required for highway signs?

Accepted Answer

Highway specifications typically require a minimum of 3M Type IV High Intensity Prismatic (HIP) reflective sheeting for highway signs, with 3M Type XI DG Cube (Diamond Grade) recommended for high-speed corridors and critical locations. 3M Type III Engineering Grade is not permitted for national highways. All sheeting is 3M make on Aluminium or Aluminium Composite Material (ACM), screen printed and Electro-Cut films as per standard colour.

Question 3

How high should highway gantry signs be mounted?

Accepted Answer

As per IRC:79-2019 and MoRTH guidelines, the minimum vertical clearance for highway gantry signs should be 5.5 meters above the carriageway. For expressways and high-truck corridors, 6.0-7.0 meters clearance is recommended.

Question 4

Can you provide structural drawings for gantry sign foundations?

Accepted Answer

Yes, TMR Traffic Safety provides complete structural engineering including foundation drawings, structural calculations, and site-specific designs. Our drawings are prepared by qualified structural engineers and can be submitted for authority approval.

Question 5

What is the typical delivery time for highway sign projects?

Accepted Answer

Standard delivery for highway sign projects is 3-4 weeks for sign boards and 6-8 weeks for complete structures including gantry/cantilever. Large highway projects may require 8-12 weeks depending on quantity and complexity. Contact us at +91 81234 40049 for project-specific timelines.

Route Marker	600x450	Standard highways
Direction Sign	1500x900	Single destination
Direction Sign	2400x1200	Multiple destinations
Direction Sign	3000x1500	Expressways
Exit Sign	1200x900	Interchanges
Toll Plaza Sign	Custom	Toll facilities

Design Speed	Minimum Letter Height
Up to 50 km/h	150mm
51-80 km/h	200mm
81-100 km/h	250mm
101-120 km/h	300mm
Above 120 km/h	400mm

Feature	Gantry Mounted Signs	Cantilever Signs
Structure	Portal frame spanning across carriageway	Single arm extending from one side
Visibility	Visible to both directions simultaneously	Visible to one direction
Cost	Higher (requires more material)	Lower (simpler structure)
Installation	Requires road closure, complex foundation	Easier installation, smaller foundation
Maintenance	Requires traffic management for access	Easier access from shoulder
Best For	High-speed expressways, urban highways	State highways, rural roads
Wind Load	Higher resistance needed	Moderate resistance

Structure Type	Foundation Size	Depth
Gantry (2-leg)	2.5m x 2.5m x 3.0m	3.0m
Cantilever	2.0m x 2.0m x 2.5m	2.5m
Shoulder Mount	1.0m x 1.0m x 1.5m	1.5m

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MoRTH Specifications for Highway Signs

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Gantry vs Cantilever Signs - Which to Choose?

Feature Comparison

Gantry Mounted Signs

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Sign Board Construction

Gantry Structure Details

Cantilever Structure Details

Foundation Requirements

Frequently Asked Questions