Ans:- Sidewalk:- A paved path for pedestrians at the side of a road ; a pavement. Intersection:- A four-way intersection ; or crossroads, usually involvs a crossing over of two streets or roads, in areas where there are blocks and in some other cases, the crossing streets or roads are perpendicular to each other, however two roads may cross at a different angle. Block:- A large single building subdivided into seperate rooms, flats and officies. Corridor:- A long passage in a building from which doors lead into rooms. **Safety Improvement of Transportation Infrastructure:- public transport provides a mobility service to the user, as well as producing a wide impact on the system. It should be operated in such a way as to achieve in efficient & effective transportation system, To achieve this there is a need to measure the quality services as way to evaluate its performance, The safety factors are consists of three aspects:- a) safety from crime:- police presence, lighting, visible monitoring, latouts, identified help points. b) safety from accidents:- presence supports, avoidance of hazards, active safeguarding by staffs. c) preceptions of security :- conspicuousness of safety measures, mastery of network, press relations. in these way we can improve our transportation infrastructure. Solution Ans:- Sidewalk:- A paved path for pedestrians at the side of a road ; a pavement. Intersection:- A four-way intersection ; or crossroads, usually involvs a crossing over of two streets or roads, in areas where there are blocks and in some other cases, the crossing streets or roads are perpendicular to each other, however two roads may cross at a different angle. Block:- A large single building subdivided into seperate rooms, flats and officies. Corridor:- A long passage in a building from which doors lead into rooms. **Safety Improvement of Transportation Infrastructure:- public transport provides a mobility service to the user, as well as producing a wide impact on the system. It should be operated in such a way as to achieve in efficient & effective transportation system, To achieve this there is a need to measure the quality services as way to evaluate its performance, The safety factors are consists of three aspects:- a) safety from crime:- police presence, lighting, visible monitoring, latouts, identified help points. b) safety from accidents:- presence supports, avoidance of hazards, active safeguarding by staffs. c) preceptions of security :- conspicuousness of safety measures, mastery of network, press relations. in these way we can improve our transportation infrastructure..