Traffic Control Devices, sign number M1-1, which states specifically on page I-1 that: Any traffic control device design or application provision contained
DescriptionI-37 (TX) Metric.svg English: 600 mm by 600 mm (24 in by 24 in) Interstate shield (metric version), made to the specifications of the 2004 edition
DescriptionMUTCD-TX W13-8T.svg English: Texas road sign. Date 15 November 2012, 21:04:37 Source [1] Author Texas Department of Transportation SVG development