Advantages of Hy-Span

Full Roadway width across structure
Unhindered snow removal
Less exposure to catastrophic failure
Ease of roadway widening by extending culvert
Simplifies preparation of plans
Lower initial cost for most site conditions
Minimal bridge maintenance

Advantages of Precast vs. Cast-in-Place Concrete

Economy
Speed of installation - minimizes road closing time
Installation with less dependence on weather conditions

Advantages of Concrete vs. Metal

Longer life
Less maintenance
Smooth hydraulic surface
Less restrictive cover limitations
Normal backfill procedures allowable
More easily customized for special conditions

Advantages of Rigid Frame Design vs. Arch Design

Normal backfill procedures -
no additional lateral resistant required
Span, rise and laying length can be varied EXAMPLE
Skewed structure to 45 degrees DIAGRAM
No cover required - pave directly on top of deck
Vertical sidewall allow simple wingwall connection
Vertical sidewalls allow hydraulically efficient entrance condition

HERE'S A LIST OF STATES/COUNTRIES WHERE 
HY-SPAN® BRIDGES ARE ALREADY IN USE.