Upon first moving to Texas (from Cincinnati), crossing into the state at Texarkana where, suddenly, the sun came out, the median and roadside was filled with a profusion of bluebonnets and Indian paintbrush...and the milepost read 838 — something you’d not see in any other state.
I don't think so. I-30 ends west of Fort Worth when it runs into 20. Then 20 ends in west Texas between Pecos and Van Horn. The milepost at Texarkana should be in the 220-230 mile range.
If you want the highest numbered milepost, you have to come in on I-10 from Lake Charles.