Highways in Estonia
Highways in Estonia are the main transport network in Estonia. The Estonian national classification includes several classes of highways: Other than these, the national road classification includes the following categories which may also be referred to as highways in a general sense, with decreasing order of priority (and applicability of the term highway): All roads in Estonia are officially marked with 1–5 digits numbers, with no official prefixes. In addition to state highways, there are 23 920 km of local roads and around 18 398 km of private and forest roads. The total Estonian road network is  estimated to be almost 59 thousand km. Classification of highways in Estonia. The technical classification of highways is as follows: Main routes. The backbone of the Estonian national route system, national main routes ("põhimaanteed") make up a network of 1,602 kilometres of road, amounting to 10% of the total road network. The traffic numbers however make up nearly 50% of the Estonian road network's traffic volumes. The highest AADT's are around Tallinn, on the T1 between Loo and Maardu, on the T2 between Tallinn and Jüri, and on the T4 between Laagri and Kanama (the highest AADT on  Estonian national routes at 31,000). A main route is defined as a highway, that connects the capital with other large cities, connects large cities and the capital with major ports, railway points and border crossings. Currently there are 12 separate main routes. The main routes are marked with 1–2 white digits on a red shield. The speed limits on Estonian main routes are 110 or 120 on 2+2 sections and 90 on regular roads (on newer sections of road, these are adjusted according to conditions by electronic speed limit signs). The main routes are the only roads with  I class highways. The total amount is 186.6 kilometres, found on the T1, T2, T4 and T11. This number will enlarge significantly with further upgrades of the T11 and the T2 between Kose and Mäo to I class highway. There are currently no motorways in Estonia, however 24.4 kilometres of the T2 is restricted-access I class highway. Ten main routes are a part of TEN-T, six routes are a part of the International E-road network. The routes E263, E67, E20, E264 and E265 run through Estonia. The highways are maintained by the Estonian Road Administration outside city  limits. Inside cities and towns, the roads are maintained by the city government. The first stationary speed cameras in Estonia were placed on route T2. Currently there are 67 stationary speed cameras on the main routes. Support routes. Support routes ("tugimaanteed") are the second highest classification in the Estonian national route system. They make up a network of 2,405 kilometres of road, amounting to 15% of the total road network. A support route is defined as a highway, that connects towns with other towns and main routes. Currently there are 77 separate support routes. The support routes are marked with  2 black digits on an yellow shield. The support roads have no special prefix, as all Estonian roads have the prefix T. European routes. Estonia is a part of the UNECE, and therefore also has numerous E-roads running through it. The E-roads in Estonia form a network on top of the main routes and are usually signposted on all signs. They make up a network of of road. Currently there are six separate European routes in Estonia.