See pages 24-27
https://www.h-gac.com/getmedia/e8f99ae3-8658-461a-b1a0-9f56c21160b6/January-2021-Meeting-MaterialsThe Metro BRT lanes are a top priority for Metro, so there is a high probability that there will be major work on the corridor. In conjunction with the BRT lanes, TxDOT is looking to add managed lanes. The City of Houston is now opposing most or all freeway right-of-way acquisition, so that means some or all the new lanes will need to be elevated. Of course, elevated lanes tend to incite community opposition.
Looking at the three concepts in the presentation, my first impression is
First (page 25, labeled A and C): This looks like the most feasible option. It requires limited right-of-way acquisition and should be constructable without major disruption to traffic.
Concept B: This would be a construction nightmare if the lanes remain open underneath. This would probably require closure of the lanes under the elevated structure to traffic, and putting all traffic on the unaffected side while the elevated structure is built, which would allow a maximum of 3 lanes each way.
Third (page 27, labels C and A): This puts the managed lanes at the same level as the freeway, eliminating the managed lanes elevated structure, but it requires the most right-of-way. This is probably the second most feasible option, and would be preferred if minimization of elevated structures is desired.