Original sentence: It is the primary gateway to South West of England and can get very busy in summer months, congestion is common on Friday afternoons and Bank Holidays on the section south of the M4
Edited sentence: Congestion is common on Friday afternoons, particularly on Bank Holidays and during school holidays, on the section south of the M4.It is the primary gateway to the South West of England, and can get very busy in summer months.The section of motorway between junction 15 and junction 25 is a congestion hot spot, and in peak periods this section always suffers severe congestion and delays