| Material | Square Feet (Thousands) |
|---|---|
| Concrete/Precast | 94,871 |
| Block | 38,402 |
| Concrete/Unspecified | 9,003 |
| Wood/Post & Plank | 5,994 |
| Concrete/Cast-in-place | 5,942 |
| Metal/Unspecified | 4,992 |
| Berm Only | 3,884 |
| Wood/Glue Laminated | 3,704 |
| Absorptive | 3,629 |
| Wood/Unspecified | 3,060 |
| Other | 1,729 |
| Concrete/Pre-Cast | 1,295 |
| Brick | 1,279 |
| Precast Concrete | 924 |
| Concrete/ Precast | 763 |
| Conrete/Unspecified | 565 |
| Conc/Precast | 384 |
| Concrete Precast | 207 |
| Conrete/Precast | 183 |
| Other (QPL-69, HDPE) | 152 |
| Concrete/Block | 80 |
| Concrete/Precast/Formliner | 65 |
| Concrete/Cast in Place | 48 |
| Composite/Plastic | 25 |
| Clear/Paraglass | 25 |
| Other (Concrete posts,Recycled Plastic Panels) | 23 |
| Other (Polyethylene) | 17 |
| Other (Manufactured Product) | 17 |
| Wood (Unspecified) | 15 |
| Transparent | 10 |
| Cast in place | 6 |
| Other (Modular absorptive) | 5 |
| Other (Plexiglass) | 4 |
| Material | Square Feet (Thousands) |
|---|---|
| Comb/Wood/Concrete | 7,143 |
| Comb/Berm/Wood | 3,022 |
| Comb/Concrete/Block | 2,424 |
| Comb/Metal/Concrete | 2,335 |
| Comb/Berm/Concrete | 2,073 |
| Comb/Other | 1,935 |
| Comb/Berm/Metal | 1,435 |
| Comb/Concrete/Brick | 634 |
| Comb/Berm/Block | 622 |
| Comb/Wood/Metal | 464 |
| Comb/Concrete/Precast/Other(Acrylic) | 450 |
| Comb/Berm/Wood/Concrete | 348 |
| Comb/Wood/Block | 283 |
| Comb/Berm/Wood/Metal | 171 |
| Comb/Concrete/Other | 138 |
| Comb/Metal/ Concrete | 36 |
| Comb/Block/Brick | 8 |
Table 2 lists the distribution of barriers by type of material. Earth (berm), masonry block (block), brick, concrete, metal, wood, other materials (e.g., polyurethane) and combinations of materials have all been used to construct barriers.
