"Old Aged Adults." . . "Urban, regional and transport planning." . . "Buses." . . "Public Transportation Costs." . . "Sociology." . . . . . . . . . . . "The use of buses in Sheffield by elderly and handicapped people" . . "The use of buses in Sheffield by elderly and handicapped people"@en . . . . . . . . . . . . . . . . . . . . . . . . "Use of buses in Sheffield by elderly and handicapped people"@en . . "Vehicle Boarding Aids." . . "Handicapped Persons." . . "Sheffield (England)" . . "Urban Mass Transit." . . "Storbritannien." . . . . "Transport and Road Research Lab., Crowthorne (GB)" . .