I would like people with a diagnosis of Autism Spectrum Disorder (ASD) to qualify for free use of public transport. I think this should require a verifiable diagnosis of autism spectrum disorder and should be a physical item like a bus pass.
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Some research suggests that autistic people may face particular areas of difficulty when driving. They are also more likely to be unemployed and can face particular issues accessing public transport. I believe that free public transport would make commuting more viable for autistic people, increasing their employment and quality of life. Around 700,000 people are diagnosed autistic in the UK, so I don't think the cost of this will be that high year to year.