It is a good book. Several chapters are on the female body being invisible in the safety testing of cars, medical studies, and so on, some chapters are about how the female gender roles and their requirements are invisible to planners.

For instance, somewhere in South America (I think) sidewalks were made wider when the planners finally realized that many women are pushing an adult in a wheelchair or a child in a stroller while holding on to the hands of other children. Men in that country tend not to do those things so narrow sidewalks are not as big a problem for them (though wheelchair users are obviously affected whether male or female).

Town planning, in general, has tended to assume that the way men travel during the day will be the same as how women travel during the day, but the two patterns are different, on average. Men with children tend to travel to and back from work and then to recreational activities, women with children tend to travel to work only after a child or children are left at daycare, and then return trip for them will include not only picking up the children from daycare but often also going grocery-shopping. Women are also more likely to make trips to care for elderly relatives and so on. So if bus routes are based on only men's traffic patterns they may not serve women's needs very well. Data from everyone matters.

The latter chapters are sex-based only in the sense that gender roles are usually assigned by sex, but what those chapters say should be equally valid for trans women who have accepted traditional female gender roles. The biological sex chapters are not relevant for them, because they don't share the same type of body, but I don't see anything wrong in that. There are many things about being female that I don't share, say, and I don't demand that all those things should be erased. Yet that is what the trans activists seem to demand.