diff --git a/roentgen/figure.py b/roentgen/figure.py
index bdbbbb0..5aaa70e 100644
--- a/roentgen/figure.py
+++ b/roentgen/figure.py
@@ -1,3 +1,6 @@
+"""
+Figures displayed on the map.
+"""
 from typing import Any, Dict, List, Optional
 
 import numpy as np
diff --git a/roentgen/mapcss.py b/roentgen/mapcss.py
index a77b2bf..ce09855 100644
--- a/roentgen/mapcss.py
+++ b/roentgen/mapcss.py
@@ -2,7 +2,7 @@
 MapCSS scheme creation.
 """
 from pathlib import Path
-from typing import List, Optional, Dict
+from typing import List, Optional, Dict, TextIO
 
 import logging
 from colour import Color
@@ -66,6 +66,10 @@ meta {{
 
 
 class MapCSSWriter:
+    """
+    Writer that converts Röntgen scheme into MapCSS 0.2 format.
+    """
+
     def __init__(
         self,
         scheme: Scheme,
@@ -89,6 +93,15 @@ class MapCSSWriter:
         prefix: str = "",
         opacity: Optional[float] = None,
     ) -> str:
+        """
+        Add MapCSS 0.2 selector for node, way, relation, or area.
+
+        :param target: `node`, `way`, `relation`, or `area`
+        :param matcher: tag matcher of Röntgen scheme
+        :param prefix: tag prefix
+        :param opacity: icon opacity
+        :return:
+        """
         elements: Dict[str, str] = {}
 
         clean_shapes = matcher.get_clean_shapes()
@@ -126,7 +139,7 @@ class MapCSSWriter:
 
         return selector
 
-    def write(self, output_file: Path) -> None:
+    def write(self, output_file: TextIO) -> None:
         """
         Construct icon selectors for MapCSS 0.2 scheme.
         """
diff --git a/roentgen/moire_manager.py b/roentgen/moire_manager.py
index 3b2a19f..27fef17 100644
--- a/roentgen/moire_manager.py
+++ b/roentgen/moire_manager.py
@@ -145,6 +145,7 @@ class RoentgenMoire(Default, ABC):
         return test_configuration.get_command(self.clear(args[0]))
 
     def icon(self, args: Arguments) -> str:
+        """Image with Röntgen icon."""
         raise NotImplementedError("icon")
 
     def options(self, args: Arguments) -> str:
diff --git a/roentgen/osm_getter.py b/roentgen/osm_getter.py
index 17760a8..68d17a0 100644
--- a/roentgen/osm_getter.py
+++ b/roentgen/osm_getter.py
@@ -16,6 +16,8 @@ __email__ = "me@enzet.ru"
 
 
 class NetworkError(Exception):
+    """Failed network request."""
+
     def __init__(self, message: str):
         super().__init__()
         self.message: str = message
@@ -36,7 +38,7 @@ def get_osm(
     if not to_update and result_file_name.is_file():
         return result_file_name.open().read()
 
-    content: Optional[bytes] = get_data(
+    content: Optional[str] = get_data(
         "api.openstreetmap.org/api/0.6/map",
         {"bbox": boundary_box.get_format()},
         is_secure=True,
diff --git a/roentgen/osm_reader.py b/roentgen/osm_reader.py
index 338dc34..eb0ee13 100644
--- a/roentgen/osm_reader.py
+++ b/roentgen/osm_reader.py
@@ -3,11 +3,11 @@ Reading OpenStreetMap data from XML file.
 """
 import json
 import re
-import xml.etree.ElementTree as ET
 from dataclasses import dataclass
 from datetime import datetime
 from pathlib import Path
 from typing import Any, Dict, List, Optional, Set
+from xml.etree import ElementTree
 
 import numpy as np
 
@@ -65,14 +65,13 @@ class Tagged:
         return None
 
     def get_float(self, key: str) -> Optional[float]:
+        """Parse float from tag value."""
         if key in self.tags:
             return parse_float(self.tags[key])
         return None
 
     def get_length(self, key: str) -> Optional[float]:
-        """
-        Get length in meters.
-        """
+        """Get length in meters."""
         if key not in self.tags:
             return None
 
@@ -420,7 +419,7 @@ class OSMReader:
         :param file_name: input XML file
         :return: parsed map
         """
-        return self.parse_osm(ET.parse(file_name).getroot())
+        return self.parse_osm(ElementTree.parse(file_name).getroot())
 
     def parse_osm_text(self, text: str) -> Map:
         """
@@ -429,7 +428,7 @@ class OSMReader:
         :param text: XML text representation
         :return: parsed map
         """
-        return self.parse_osm(ET.fromstring(text))
+        return self.parse_osm(ElementTree.fromstring(text))
 
     def parse_osm(self, root) -> Map:
         """
diff --git a/roentgen/raster.py b/roentgen/raster.py
index 6f77424..ccac9c7 100644
--- a/roentgen/raster.py
+++ b/roentgen/raster.py
@@ -1,3 +1,6 @@
+"""
+Rasterize vector graphics using Inkscape.
+"""
 import os
 import subprocess
 from pathlib import Path
diff --git a/roentgen/road.py b/roentgen/road.py
index 4a8edb5..a78a132 100644
--- a/roentgen/road.py
+++ b/roentgen/road.py
@@ -29,13 +29,8 @@ class Lane:
     change: Optional[str] = None  # "not_left", "not_right"
     destination: Optional[str] = None  # Lane destination
 
-    def set_forward(self, is_forward: bool) -> None:
-        self.is_forward = is_forward
-
     def get_width(self, scale: float):
-        """
-        Get lane width.  We use standard 3.7 m lane.
-        """
+        """Get lane width.  We use standard 3.7 m lane."""
         if self.width is None:
             return 3.7 * scale
         return self.width * scale