Italy: Navteq Map Features Comparison with UK and US
| country | link count | total link length | % of links with speed limit |
|---|---|---|---|
| Italy | 5,476,802 | 715,786 km | 29 |
| UK | 3,633,006 | 488,913 km | 25 |
| US | 28,276,446 | 8,844,095 km | 3 |
Road-category distribution based on density
Italy
UK
US
Road-category distribution based on speed-category
Italy
UK
US
Percentage of links in each road category
Italy
UK
US
Road density distribution
Road density attribute (rd1000) defined by MyDrive represents the number of links in a 1 kilometer radius around a given road link.
Urban/non-urban distribution
Urban flag Navteq attribute identifies links located within a built-up area polygon.
- Y: urban
- N: not urban
Link length distribution
Lane_category distribution
Lane_category classifies a road link based on the number of lanes in each direction. If the number of lanes is different for each direction of travel on the link, the higher of the two numbers is applied.
- 1: one lane
- 2: two or three lanes
- 3: four or more lanes
Functional_class distribution
Functional_class is a measure of how important a road link is for routing traffic. It ranges (in NAVTEQ maps) from 1 to 5, where 1 is the most important and 5 the least. Most motorways are FC1, and most local roads FC5.
Speed_category distribution
Speed_category NAVTEQ attribute classifies the speed of a road link based on posted or legal speed and is provided to enhance route calculation. It takes value from 1 to 8, where 1 corresponds to the highest and 8 corresponds to the lowest speed limit range.
| speed_category | speed_limit range in kph | speed_limit range in mph |
|---|---|---|
| 1 | > 130 | > 80 |
| 2 | 101 - 130 | 65 - 80 |
| 3 | 91 - 100 | 55 - 64 |
| 4 | 71 - 90 | 41 - 54 |
| 5 | 51 - 70 | 31 - 40 |
| 6 | 31 - 50 | 21 - 30 |
| 7 | 11 - 30 | 6 - 20 |
| 8 | < 11 | < 6 |
Speed_category vs lane_category
Italy
UK
US
Speed_category vs functional_class
Italy
UK
US
Link length index vs speed_category
Road links are grouped by length into 8 categories. The link length index ranges from 0 to 7, where 0 is the shortest and 7 is the longest link length bucket.
| length range in meters | index |
|---|---|
| 0 - 30 | 0 |
| 30 - 78.125 | 1 |
| 78.125 - 156.25 | 2 |
| 156.25 - 781.25 | 3 |
| 781.25 - 1406.25 | 4 |
| 1406.25 - 1953.125 | 5 |
| 1953.125 - 2500 | 6 |
| 2500+ | 7 |
Italy
UK
US
Percentage of speed_limit data per road category
Speed_limit in NAVTEQ map data only exists for a few number of links. Hereafter, we show the percentage of links with/without speed_limit in each road category and for each country.
Italy
UK
US
Speed_limit distribution per road category
The distribution of speed_limit data from NAVTEQ maps per road category is shown below for each country.
Italy
UK
US
Speed limit distribution per road category (including speed limit derived from speed category)
When speed_limit does not exist in NAVTEQ map data for a given road link, we use instead the upper-bound value of the corresponded speed_category. Hereafter, we show the distirbution of the resulting speed_limit data per road category for each country.
Italy
UK
US
Link length distribution per road category
Italy
UK
US
