Complete the text adding suffixes, prefixes or the both with the root words given in the parentheses,

Public transportation in cities faces (a) _____ (efficient) due to traffic congestion. Commuters often experience (b) _____ (delay) journeys, leading to (c) ______ (frustrate). (d) ______ (implement) the modern systems like metro rails could provide (e) _____ (rely) services. However, (f) _____ (maintain) requires ongoing (g) _____ (invest). Passengers appreciate (h) ______ (comfort) rides without (i) _____ (overcrowd). Ultimately, (j) ______ (improve) infrastructure benefits everyone in urban areas.