This document discusses potential issues and solutions for filming at two locations:
1) A walkway under a busy motorway would be extremely noisy, and people may walk through. Filming late at night when it is less busy could help avoid others in the background. A loud speaker could help the actor hear over traffic noise.
2) A rooftop location has no shelter from rain and limited lighting. Weather would need to be checked and filming rescheduled if raining. Additional lighting may need to be borrowed from school.