Very bumpy and uneven cycle path/pavement along side the portway

The pavement along side the Portway which acts as the cycle path between Sea Mills station and the centre is very bumpy and uneven which makes cycling very difficult and uncomfortable - when I try to commute on it it gives me a headache. This discourages people from cycling but also means that more cyclists use the 50mph bus lane to cycle in instead (which is also only an option one way) and which is very dangerous as contains several blind bends and requires cyclists to duck into the 50mph traffic to get out of the way of busses. NB the pictures are over a year old (google maps) and it has gotten much worse in this time. It is in desperate need of smooth retarmacking and would mean many more people would cycle rather than using other public transport or driving.