The phrase "are often not accessible" is correct and usable in written English.
It can be used to describe situations or resources that are frequently difficult to reach or obtain.
Example: "Many important documents are often not accessible to the general public due to privacy concerns."
Alternatives: "are frequently unavailable" or "are commonly hard to reach."
Activated enhancers are often not accessible prior to induction.
The standard algorithms used to search for shortest paths in building layouts return results which are less costly, but the obtained routes are often not accessible by disabled or too difficult to pass.
They noted (page 162) that "long-term evolution proceeds by an infinite sequence of transitions from one fixed set of genotypes to another fixed set of genotypes, with each of these sets subject to short-term evolution…" Optima are often not accessible in the short-term due to constraints on available variation.
The cost is high: Girls with disabilities often drop out of school once they reach puberty because there are no support services in school to help them during their period and the toilets are often not accessible or safe.
It is difficult making my way to classes because the classrooms are often not accessible to wheelchair users.
Reproductive tissues for studying embryo-sac development before anthesis (e.g. after Herr, 1971, 1992) are often not accessible in high-alpine plants.
Another related source of risk is the information associated with the random time concerning resulting payments, the price impact, the loss given default or the recovery rate, etc. Measuring these random quantities is, in general, difficult since the relevant information on the underlying firm is often not accessible to investors on the market.
To this end, we established 35 1-km line transects, which were evenly distributed to the extent feasible in dense dry deciduous forest; forest areas without abandoned logging trails or oil exploration tracks were often not accessible.
Medical treatment, including ARV provision and medications for OI, is increasingly available but is often not accessible to PLHIV because of a weak referral system and social stigma [ 3, 7].
Tanvi Vyas, campaign officer of Muscular Dystrophy Campaign's Trailblazers, a network of young disabled people, said old university buildings, including libraries, are often not fully accessible, if at all.
