49 CFR Part 37 - Transportation for Individuals With Disabilities; Reasonable Modification of Policies and Practices

C. As noted above, the responsibility of entities to make requested reasonable modifications is not without some limitations. There are four classes of situations in which a request may legitimately be denied. The first is where granting the request would fundamentally alter the entity's services, programs, or activities. The second is where granting the request would create a direct threat to the health or safety of others. The third is where without the requested modification, the individual with a disability is able to fully use the entity's services, programs, or activities for their intended purpose. The fourth, which applies only to recipients of Federal financial assistance, is where granting the request would cause an undue financial and administrative burden. In the examples that follow, these limitations are taken into account.