Each quarter, Roads and Maritime Services releases a report on a number of roads in NSW, measuring key indicators such as average travel time and speed.

The report includes six of the most used roads in the Wollongong area.

The statistics show that, in the spring 2014 quarter, drivers in the morning peak travelling from Bulli to Wollongong drove slower and took longer than when they made that same trip home in the evening peak.

In the morning run, motorists averaged a speed of 48.5km/h and took almost 19 minutes to get to Wollongong.

In the evening, when it was home time, the average speedometer reading was 51.7km/h and the time taken was 17.6 minutes.

It wasn't just the last three months either - the same thing has happened in each of the last five quarters.

Each time, the average speed increases by about 2-3km/h on the way home and the trip becomes several minutes quicker.

The only measured road of a similar length that boasts a faster run home is Mount Ousley Road from Bulli Tops to Mount Ousley.

On the southbound journey in the evening, the average speed last quarter was 25km/h faster and more than six minutes quicker.

But unlike Memorial Drive, Mount Ousley Road is a downhill run in the evening and has no traffic lights.

A spokesman for RMS said that rather than the evening peak speeds getting better, it's actually the morning speeds that are getting worse.

"Statistics from Roads and Maritime Services Roads Report show morning peak speed is decreasing and afternoon peak is improving or largely stable in the past decade," the spokesman said.

"Destinations for morning peak, including school and work, tend to start at the same time, while school is generally finished before the afternoon traffic peak," the spokesman said.

"Organisations are also encouraging flexible work times, which can spread afternoon traffic across a longer time frame."