"Cardiff Crime and Safety Statistics | CrimeRate"
https://crimerate.co.uk/south-glamorgan/cardiff
The most common crimes in Cardiff are violence and sexual offences, with 5,816 offences during 2020, giving a crime rate of 16. This is 8% lower than 2019's figure of 6,292 offences and a difference of 1.35 from 2019's crime rate of 18. Cardiff's least common crimes are possession of weapons, with 138 offences recorded in 2020, a decrease of 19% from 2019's figure of 164 crimes
5816/12 = 484.6666 (per month) for the entire city.
I don't think one road would be the hub for nearly half the violent and sexual crimes in the entire city.