Survey Questionnaire
The survey questionnaire was used to gather attitudes and practices. It had 26 questions which were read verbatim by the interviewer. Taking into account the education background of most commercial motorcyclists, Swahili version of the questionnaire was used for easy comprehensibility and therefore ensured the validity of responses. Time estimated for interview was 15 minutes. The survey questionnaire had questions regarding demographics, attitude towards and practice of helmet use. Positive and negative worded statements were developed for measuring attitude of commercial motorcyclists towards helmet use. A 5- item Likert scale was used, ranging from 1 (strongly disagree) to 5 (strongly agree). The negatively worded statements were reverse scored. Higher scores indicated positive attitude towards helmet use.