Section 4: Concrete Railing
Section 4: Concrete Railing
Traffic Railing Type T221
Traffic Railing Type T221
Classification | Traffic |
Description | Vertical-faced concrete parapet. This parapet is taller and thicker than the T201 railing, from which its design is derived, allowing optional use of welded wire reinforcement. |
Approved test criteria and level | Evaluated and approved for MASH TL-3. |
Nominal height | 32 inches |
Minimum height after maintenance overlays | 30 inches |
Figure A–18. Type T221 Railing
Traffic Railing Type T222
Traffic Railing Type T222
Classification | Traffic |
Description | Vertical-faced concrete parapet. This parapet is taller and thicker than the T201 railing, from which its design is derived, allowing optional use of welded wire reinforcement. |
Approved test criteria and level | Evaluated and approved for MASH TL-4. |
Nominal height | 38 inches |
Minimum height after maintenance overlays | 36 inches |
Figure A–19. Type T222 Railing
Traffic Railing Type T221P
Traffic Railing Type T221P
Classification | Traffic |
Description | A precast version of the T221 vertical-faced concrete parapet. |
Approved test criteria and level | Successfully crash-tested and approved for MASH TL-3 |
Nominal height | 32 inches |
Minimum height after maintenance overlays | 30 inches |
Figure A–20. Type T221P Railing
Traffic Railing Type T223
Traffic Railing Type T223
Classification | Traffic |
Description | Continuous concrete top beam 19 inches high by 15.5 inches wide on 13-inch-high concrete posts that are 4 ft. long and spaced a maximum of 10 ft. apart. |
Approved test criteria and level | Evaluated and approved for MASH TL-3 |
Nominal height | 32 inches |
Minimum height after maintenance overlays | 30 inches |
Special notes | This railing is not recommended for direct connectors or flyovers. |
Figure A–21. T223 Railing
Traffic Railing Type T224
Traffic Railing Type T224
Classification | Traffic |
Description | Continuous concrete top beam 21 inches high by 16.5 inches wide, on a 9-inch-high continuous curb and 12-inch-tall concrete posts that are 5 ft. long and spaced a maximum of 10 ft. apart. |
Approved test criteria and level | Successfully crash-tested and approved for MASH TL-5. |
Nominal height | 42 inches |
Minimum height after maintenance overlays | 40 inches |
Figure A–22. Type T224 Railing
Traffic Railing Type T411
Traffic Railing Type T411
Classification | Traffic |
Description | Continuous concrete railing that has 6-inch-wide windows spaced every 18 inches, center to center. |
Approved test criteria and level | Successfully crash-tested and approved for MASH TL-2. |
Nominal height | 32 inches |
Minimum height after maintenance overlays | 30 inches |
Figure A–23. Type T411 Railing
Traffic Railing Type T551
Traffic Railing Type T551
Classification | Traffic |
Description | Concrete F-shaped parapet. |
Approved test criteria and level | Evaluated and approved for MASH TL-3. |
Nominal height | 32 inches |
Minimum height after maintenance overlays | 29 inches |
Figure A–24. Type T551 Railing
Traffic Railing Type T552
Traffic Railing Type T552
Classification | Traffic |
Description | Concrete F-shaped parapet with multiple drain slots |
Approved test criteria and level | Evaluated and approved for MASH TL-3. |
Nominal height | 32 inches |
Minimum height after maintenance overlays | 29 inches |
Figure A–25. Type T552 Railing
Traffic Railing Type T66
Traffic Railing Type T66
Classification | Traffic |
Description | Concrete post-and-beam railing. It has a 9-inch-tall concrete curb with concrete posts spaced at 6.5 feet maximum. The concrete railing is 12 inches deep and 12 inches wide. |
Approved test criteria and level | Successfully crash-tested and approved for MASH TL-3. |
Nominal height | 32 inches |
Minimum height after maintenance overlays | 30 inches |
Figure A–26. Type T66 Railing
Traffic Railing Type SSTR
Traffic Railing Type SSTR
Classification | Traffic |
Description | Concrete parapet with a single front slope |
Approved test criteria and level | Successfully crash-tested and approved for MASH TL-4. |
Nominal height | 36 inches |
Minimum height after maintenance overlays | 32 inches |
Figure A–27. Type SSTR Railing
Traffic Railing Type T80SS
Traffic Railing Type T80SS
Classification | Traffic |
Description | Concrete parapet with a single front slope and aesthetic reveals along exterior face. |
Approved test criteria and level | Evaluated and approved for MASH TL-5. |
Nominal height | 42 inches |
Minimum height after maintenance overlays | 42 inches |
Special notes | Non-standard slab details are required for this railing. |
Figure A–28. Type T80SS Railing
Traffic Railing Type C411
Traffic Railing Type C411
Classification | Traffic |
Description | Continuous concrete railing that has 6-inch-wide windows spaced every 18 inches, center to center. |
Approved test criteria and level | Successfully crash-tested and approved for MASH TL-2. |
Nominal height | 42 inches |
Minimum height after maintenance overlays | 42 inches |
Figure A–29. Type C411 Railing
Traffic Railing Type C412
Traffic Railing Type C412
Classification | Combination |
Description | Continuous concrete railing that has 6-inch-wide windows spaced every 18 inches, center to center. |
Approved test criteria and level | Successfully crash-tested and approved for MASH TL-5. |
Nominal height | 42 inches |
Minimum height after maintenance overlays | 42 inches |
Figure A–30. Type C412 Railing
Traffic Railing Type T80TT
Traffic Railing Type T80TT
Classification | Traffic |
Description | 90-inch-high continuous concrete railing with a 42-inch-tall single-slop base topped with a 48-inch-tall wall and beam. |
Approved test criteria and level | Evaluated and approved for MASH TL-6. It is derived from the Type TT railing, which was successfully crash-tested to NCHRP 350 TL-6 criteria. |
Nominal height | 90 inches |
Minimum height after maintenance overlays | 90 inches |
Special notes | This railing is not issued as a TxDOT standard railing type. Nonstandard slab details are required for this railing. |
Figure A–31 Type T80TT Railing