Not all roads are made equal and some are more dangerous than others. Road builders sometimes do not consider/plan all safety aspects when building. This could be one of them with a steep gradient. Worst case for cyclist, dismount and push the bike down if feels unsafe. This can also be dangerous for motorcycles?
I remember quite a few years ago of getting into a taxi that had a partition in it due to being mugged one or two times. It was the most cramped uncomfortable taxi ride I have ever been in. I am about 5'10, so even my height or anything above that is torture.. Never again with their box cars. If they have it I will just say no thank you.. And also isn't the key for ventilation? No matter what you put in it as a barrier, the fact is unless is is 100% sealed off it aint gonna work.
With the early vaccine adopter Israel figures, adopted to population, 57 300 would have died (7611 deaths by now). With the heard immunity strategy chosen Sweden it would be 92 000 (14772). Out of 70 million Thais and most of them very old. That is the range of deaths to be expected.
Sweden faced the virus head on, not only one but two waves without vaccines and with pretty relaxed restrictions, and had only 14 percent vaccination rate as of 1st of June, after the 2nd wave subsided.
Thailand should be opened. These restrictions are hurting a lot of poor people a lot because they live barely paycheck-to-paycheck.