The DEC for urban transport in greater Adelaide is projected to grow from $7 billion in 2011 to $12 billion in 2031 - a growth rate of 3.1 per cent per year. The cost of delay on Adelaide's urban transport network in 2011 was around $1 billion. In the absence of any additional capacity (other than projects already under construction or funded), the cost of delay is projected to grow to $4 billion in 2031.