Depending on the type of map you are referring to, the solid black line could indicate a national boundary. If it is a map of states, it could be a state boundary.
A continuous red line indicates main roads, a thick broken red line with long dashes represents carriageways under construction. A broken red line with short dashes represents a National Cycle Route
Black represents roads, railroads, highways, bridges, place names, buildings, and borders.
warm wind dam it
What do the heavy solid lines on the map stand for ?
On some maps- if the map is of an area near the equator. It will be a horizontal solid line.
For many maps, major cities (e.g. population over 1,500,001) use a large solid black circle as the symbol. Cities with populations 1,000,001 to 1,500,000 and cities up to 1,000,000 each use a smaller solid black circle. State capital often uses a solid black star symbol on a map.
A contact line on a geologic map is noted by a solid or dotted horizontal line with breaks sectioned off by a small vertical line below it. A fault line is noted as a horizontal dotted line with wide dashes.
Is it X? Brought to you by xrehabv4
The Key, or Legend, or a map gives a list of the symbols used on the map and what they represent. There is a fairly standard set of symbols used for different types of map so that anyone looking at the map can understand what it is being shown. For example, on a weather map a cold front is shown as a black line with semi-circular bumps (in blue if coloured), a warm front is shown as a black line with triangles (in red if coloured) and an occluded front is shown as a black line with alternate semi-circular bumps and triangles.
Depending on the type of map you are referring to, the solid black line could indicate a national boundary. If it is a map of states, it could be a state boundary.
boarders
A national boundry is a thick black line
The national boundaries
On some maps- if the map is of an area near the equator. It will be a horizontal solid line.
It is common for a map "key" or legend to gauge the size of cities on a map. For example, a city with a population of over 200,000 may be marked by a black dot surrounded by a black bordered circle line. White is the shade between the black dot and the black line of the circle.
Contour lines on a map are typically brown or black in color. They indicate elevation changes on the map.
For many maps, major cities (e.g. population over 1,500,001) use a large solid black circle as the symbol. Cities with populations 1,000,001 to 1,500,000 and cities up to 1,000,000 each use a smaller solid black circle. State capital often uses a solid black star symbol on a map.
A contact line on a geologic map is noted by a solid or dotted horizontal line with breaks sectioned off by a small vertical line below it. A fault line is noted as a horizontal dotted line with wide dashes.
Is it X? Brought to you by xrehabv4
The Key, or Legend, or a map gives a list of the symbols used on the map and what they represent. There is a fairly standard set of symbols used for different types of map so that anyone looking at the map can understand what it is being shown. For example, on a weather map a cold front is shown as a black line with semi-circular bumps (in blue if coloured), a warm front is shown as a black line with triangles (in red if coloured) and an occluded front is shown as a black line with alternate semi-circular bumps and triangles.
lines around each state. that depends on the map. they vary. the only way to be sure is to check the map legend. it will tell you what each symbol means.