The Warrego Highway is located in southern Queensland, Australia. It connects coastal centres to the south western areas of the state, and is approximately 715 km in length. It takes its name from the Warrego River, which is the endpoint of the highway. The entire highway is part of the National Highway system linking Darwin and Brisbane: formerly National Highway 54, Queensland began to convert to the alphanumeric system much of Australia had adopted in the early-2000s and this road is now designated as National Highway A2. Route description The highway commences at the end of the M2 Ipswich Motorway, near Ipswich and runs to Helidon Spa, at the foot of the Great Dividing Range. From there it follows the Toowoomba Bypass to Charlton, west of Toowoomba. The Warrego then crosses the Darling Downs, bypassing the town of Oakey and then passing through the towns of Dalby, Chinchilla and Miles, in the Western Downs. The highway continues through the towns of Roma and Mitchell in the Maranoa Region of South West Queensland. After Morven, the A2 Route continues north-west along the Landsborough Highway, with the western turnoff continuing the Warrego Highway down to its terminus at Charleville. The section of highway between Ipswich and Charlton is mostly motorway grade; a four lane divided highway with motorway-style on-ramps and off-ramps. At a point between Charlton and Oakey the highway merges from 4 to 2 lanes (however, throughout 2017-2019, the highway was planned to be duplicated up until Oakey) Then, the highway mostly continues in a straight line with minimal turns. At Dalby, the highway briefly returns to 4 lanes (where a longer stretch of the highway was planned to be duplicated in 2017). The Warrego then continues as a rural 2 lane highway, until Charleville. Terrain The Warrego Highway's lowest point along its length is 3.69 m just east of where it crosses the Bremer River near Ipswich, and its highest elevation is at the top of the Great Dividing Range on the Toowoomba Bypass. Speed zones Ipswich Motorway - Blacksoil 100 km/h Blacksoil - Toowoomba Bypass merge 100 km/h, with a drop to 80 km/h and/or 60 km/h through some towns Great Dividing Range (Toowoomba Bypass to Charlton) 80 km/h to 100 km/h Charlton - Kingsthorpe 90 km/h Kingsthorpe - Dalby 100 km/h except through Jondaryan, which is 80 km/h. Dalby - 60 km/h Dalby - Chinchilla 100 km/h except