They will tell MPs how disabled passengers have been left stranded at bus stops or refused entry to buses.
The Muscular Dystrophy Campaign’s Trailblazers group will also speak of how disabled people are repeatedly ignored by taxi drivers or have been charged double the usual fare.
One of the group, Judith Merry, 22, a wheelchair user from Aylesbury in Buckinghamshire, was left stranded at a bus stop late at night in a quiet part of London.
She and her mother attempted to board a bus, but after Ms Merry’s mother got on, the driver pulled away instead of putting down the bus’s ramp, claiming not to have seen her.
Trailblazers also spoke of disabled people being sworn at by cabbies.
Trailblazers project manager Bobby Ancil said: “Disabled people have the same need to use buses and taxis as non-disabled people – to get to work, to get to appointments and to socialise with friends and family.
“Unfortunately, our public transport system and taxi companies have not moved forward enough to offer a basic service and fair standards to disabled passengers.
“Be it physical access or the attitudes of business owners and drivers, disabled travellers are facing obstacles daily that should have been left way back in the past.”