diff --git a/frontend/package-lock.json b/frontend/package-lock.json
index 6e2f75e..fe039ad 100644
--- a/frontend/package-lock.json
+++ b/frontend/package-lock.json
@@ -13,6 +13,7 @@
         "classnames": "^2.3.1",
         "downloadjs": "^1.4.7",
         "fomantic-ui-less": "^2.8.8",
+        "immer": "^9.0.7",
         "luxon": "^1.28.0",
         "maplibre-gl": "^1.15.2",
         "mini-css-extract-plugin": "^2.4.5",
@@ -4873,6 +4874,15 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/immer": {
+      "version": "9.0.7",
+      "resolved": "https://registry.npmjs.org/immer/-/immer-9.0.7.tgz",
+      "integrity": "sha512-KGllzpbamZDvOIxnmJ0jI840g7Oikx58lBPWV0hUh7dtAyZpFqqrBZdKka5GlTwMTZ1Tjc/bKKW4VSFAt6BqMA==",
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/immer"
+      }
+    },
     "node_modules/import-fresh": {
       "version": "3.3.0",
       "resolved": "https://registry.npmjs.org/import-fresh/-/import-fresh-3.3.0.tgz",
@@ -12790,6 +12800,11 @@
       "optional": true,
       "peer": true
     },
+    "immer": {
+      "version": "9.0.7",
+      "resolved": "https://registry.npmjs.org/immer/-/immer-9.0.7.tgz",
+      "integrity": "sha512-KGllzpbamZDvOIxnmJ0jI840g7Oikx58lBPWV0hUh7dtAyZpFqqrBZdKka5GlTwMTZ1Tjc/bKKW4VSFAt6BqMA=="
+    },
     "import-fresh": {
       "version": "3.3.0",
       "resolved": "https://registry.npmjs.org/import-fresh/-/import-fresh-3.3.0.tgz",
diff --git a/frontend/package.json b/frontend/package.json
index 58f3bc0..172cfc5 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -12,6 +12,7 @@
     "classnames": "^2.3.1",
     "downloadjs": "^1.4.7",
     "fomantic-ui-less": "^2.8.8",
+    "immer": "^9.0.7",
     "luxon": "^1.28.0",
     "maplibre-gl": "^1.15.2",
     "mini-css-extract-plugin": "^2.4.5",
diff --git a/frontend/src/components/Map/index.tsx b/frontend/src/components/Map/index.tsx
index 7d9f25c..120325e 100644
--- a/frontend/src/components/Map/index.tsx
+++ b/frontend/src/components/Map/index.tsx
@@ -1,4 +1,5 @@
 import React, {useState, useCallback, useMemo, useEffect} from 'react'
+import {connect} from 'react-redux'
 import _ from 'lodash'
 import ReactMapGl, {WebMercatorViewport, AttributionControl, NavigationControl} from 'react-map-gl'
 import turfBbox from '@turf/bbox'
@@ -6,10 +7,13 @@ import {useHistory, useLocation} from 'react-router-dom'
 
 import {useConfig} from 'config'
 
-import {basemap} from '../../mapstyles'
+import {baseMapStyles} from '../../mapstyles'
+
 
 const EMPTY_VIEWPORT = {longitude: 0, latitude: 0, zoom: 0}
 
+export const withBaseMapStyle = connect((state) => ({baseMapStyle: state.mapConfig?.baseMap?.style ?? 'positron'}))
+
 function parseHash(v) {
   if (!v) return null
   const m = v.match(/^#([0-9\.]+)\/([0-9\.]+)\/([0-9\.]+)$/)
@@ -41,15 +45,17 @@ function useViewportFromUrl() {
 }
 
 
-export default function Map({
+function Map({
   viewportFromUrl,
   children,
   boundsFromJson,
+  baseMapStyle,
   ...props
 }: {
   viewportFromUrl?: boolean
-  children: React.ReactNode
-  boundsFromJson: GeoJSON.Geometry
+    children: React.ReactNode
+    boundsFromJson: GeoJSON.Geometry
+  baseMapStyle: string
 }) {
   const [viewportState, setViewportState] = useState(EMPTY_VIEWPORT)
   const [viewportUrl, setViewportUrl] = useViewportFromUrl()
@@ -81,7 +87,7 @@ export default function Map({
   }, [boundsFromJson])
 
   return (
-    <ReactMapGl mapStyle={basemap} width="100%" height="100%" onViewportChange={setViewport} {...viewport} {...props}>
+    <ReactMapGl mapStyle={baseMapStyles[baseMapStyle]} width="100%" height="100%" onViewportChange={setViewport} {...viewport} {...props}>
       <AttributionControl
         style={{right: 0, bottom: 0}}
         customAttribution={[
@@ -96,3 +102,5 @@ export default function Map({
     </ReactMapGl>
   )
 }
+
+export default withBaseMapStyle(Map)
diff --git a/frontend/src/mapstyles/index.js b/frontend/src/mapstyles/index.js
index 28e3a62..e40e5a3 100644
--- a/frontend/src/mapstyles/index.js
+++ b/frontend/src/mapstyles/index.js
@@ -4,6 +4,7 @@ import bright from './bright.json'
 import positron from './positron.json'
 
 export {bright, positron}
+export const baseMapStyles = {bright, positron}
 
 export function colorByDistance(attribute = 'distance_overtaker_mean', fallback = '#ABC') {
   return [
diff --git a/frontend/src/pages/MapPage/LayerSidebar.tsx b/frontend/src/pages/MapPage/LayerSidebar.tsx
new file mode 100644
index 0000000..56d601a
--- /dev/null
+++ b/frontend/src/pages/MapPage/LayerSidebar.tsx
@@ -0,0 +1,29 @@
+import React from 'react'
+import {connect} from 'react-redux'
+import {List, Select} from 'semantic-ui-react'
+
+import * as mapConfigActions from 'reducers/mapConfig'
+
+const BASEMAP_STYLE_OPTIONS = [
+  {key: 'positron', value: 'positron', text: 'Positron'},
+  {key: 'bright', value: 'bright', text: 'OSM Bright'},
+]
+
+function LayerSidebar({mapConfig, setBasemapStyle}) {
+  return (
+    <div>
+      <List>
+        <List.Item>
+          <List.Header>Basemap Style</List.Header>
+          <Select
+            options={BASEMAP_STYLE_OPTIONS}
+            value={mapConfig?.baseMap?.style ?? 'positron'}
+            onChange={(_e, {value}) => setBasemapStyle(value)}
+          />
+        </List.Item>
+      </List>
+    </div>
+  )
+}
+
+export default connect((state) => ({mapConfig: state.mapConfig}), mapConfigActions)(LayerSidebar)
diff --git a/frontend/src/pages/MapPage/RoadInfo.tsx b/frontend/src/pages/MapPage/RoadInfo.tsx
index 183bd4a..9d0151b 100644
--- a/frontend/src/pages/MapPage/RoadInfo.tsx
+++ b/frontend/src/pages/MapPage/RoadInfo.tsx
@@ -8,6 +8,8 @@ import {switchMap, distinctUntilChanged} from 'rxjs/operators'
 
 import api from 'api'
 
+import styles from './styles.module.less'
+
 const UNITS = {distanceOvertaker: 'm', distanceStationary: 'm', speed: 'm/s'}
 const LABELS = {distanceOvertaker: 'Overtaker', distanceStationary: 'Stationary', speed: 'Speed'}
 const ZONE_COLORS = {urban: 'olive', rural: 'brown', motorway: 'purple'}
@@ -90,7 +92,7 @@ export default function RoadInfo({clickLocation}) {
 
   const loading = info == null
 
-  const offsetDirection = info?.road.oneway ? 0 : direction === 'forwards' ? 1 : -1 // TODO: change based on left-hand/right-hand traffic
+  const offsetDirection = info?.road?.oneway ? 0 : direction === 'forwards' ? 1 : -1 // TODO: change based on left-hand/right-hand traffic
 
   const content =
     !loading && !info.road ? (
diff --git a/frontend/src/pages/MapPage/index.tsx b/frontend/src/pages/MapPage/index.tsx
index b8cef55..c08358e 100644
--- a/frontend/src/pages/MapPage/index.tsx
+++ b/frontend/src/pages/MapPage/index.tsx
@@ -1,5 +1,6 @@
 import React, {useState, useCallback} from 'react'
 import _ from 'lodash'
+import {Sidebar, Button} from 'semantic-ui-react'
 import {Layer, Source} from 'react-map-gl'
 
 import {Page, Map} from 'components'
@@ -8,9 +9,9 @@ import {useConfig} from 'config'
 import {roadsLayer} from '../../mapstyles'
 
 import RoadInfo from './RoadInfo'
+import LayerSidebar from './LayerSidebar'
 import styles from './styles.module.less'
 
-
 export default function MapPage() {
   const {obsMapSource} = useConfig() || {}
   const [clickLocation, setClickLocation] = useState<{longitude: number; latitude: number} | null>(null)
@@ -30,6 +31,8 @@ export default function MapPage() {
     [setClickLocation]
   )
 
+  const [layerSidebar, setLayerSidebar] = useState(true)
+
   if (!obsMapSource) {
     return null
   }
@@ -37,13 +40,27 @@ export default function MapPage() {
   return (
     <Page fullScreen>
       <div className={styles.mapContainer}>
-        <Map viewportFromUrl onClick={onClick}>
-          <Source id="obs" {...obsMapSource}>
-            <Layer {...roadsLayer} />
-          </Source>
+        {layerSidebar && <div className={styles.mapSidebar}><LayerSidebar /></div>}
+        <div className={styles.map}>
+          <Map viewportFromUrl onClick={onClick}>
+            <Button
+              style={{
+                position: 'absolute',
+                left: 44,
+                top: 9,
+              }}
+              primary
+              icon="bars"
+              active={layerSidebar}
+              onClick={() => setLayerSidebar(layerSidebar ? false : true)}
+            />
+            <Source id="obs" {...obsMapSource}>
+              <Layer {...roadsLayer} />
+            </Source>
 
-          <RoadInfo {...{clickLocation}} />
-        </Map>
+            <RoadInfo {...{clickLocation}} />
+          </Map>
+        </div>
       </div>
     </Page>
   )
diff --git a/frontend/src/pages/MapPage/styles.module.less b/frontend/src/pages/MapPage/styles.module.less
index bf15b20..654d7e6 100644
--- a/frontend/src/pages/MapPage/styles.module.less
+++ b/frontend/src/pages/MapPage/styles.module.less
@@ -2,8 +2,21 @@
 
 .mapContainer {
   height: calc(100vh - @menuHeight);
-  background: red;
+  background: #F0F0F3;
   position: relative;
+  display: flex;
+  align-items: stretch;
+}
+
+.mapSidebar {
+  width: 20rem;
+  background: white;
+  border-right: 1px solid @borderColor;
+  padding: 1rem;
+}
+
+.map {
+  flex: 1 1 0;
 }
 
 .mapInfoBox {
@@ -15,3 +28,4 @@
   overflow: auto;
   margin: 20px;
 }
+
diff --git a/frontend/src/reducers/index.js b/frontend/src/reducers/index.js
index 0cfe682..5c82fc6 100644
--- a/frontend/src/reducers/index.js
+++ b/frontend/src/reducers/index.js
@@ -1,5 +1,6 @@
 import {combineReducers} from 'redux'
 
 import login from './login'
+import mapConfig from './mapConfig'
 
-export default combineReducers({login})
+export default combineReducers({login, mapConfig})
diff --git a/frontend/src/reducers/mapConfig.ts b/frontend/src/reducers/mapConfig.ts
new file mode 100644
index 0000000..a8e0b23
--- /dev/null
+++ b/frontend/src/reducers/mapConfig.ts
@@ -0,0 +1,33 @@
+import produce from 'immer'
+
+type BaseMapStyle = 'positron' | 'bright'
+type MapConfigState  = {
+  baseMap: {
+    style: BaseMapStyle
+  }
+}
+
+const initialState: MapConfigState = {
+  baseMap: {
+    style: 'positron',
+  },
+}
+
+export function setBasemapStyle(style: BaseMapStyle) {
+  return {type: 'MAPCONFIG.SET_BASEMAP_STYLE', payload: {style}}
+}
+
+export default function mapConfigReducer(state = initialState, action) {
+  switch (action.type) {
+    case 'MAPCONFIG.SET_BASEMAP_STYLE':
+      return produce(state, draft => {
+        if (!draft.baseMap) {
+          draft.baseMap = {}
+        }
+        draft.baseMap.style = action.payload.style
+      })
+
+    default:
+      return state
+  }
+}
diff --git a/frontend/src/store.js b/frontend/src/store.js
index 53f6e98..7b31629 100644
--- a/frontend/src/store.js
+++ b/frontend/src/store.js
@@ -3,7 +3,7 @@ import persistState from 'redux-localstorage'
 
 import rootReducer from './reducers'
 
-const enhancer = compose(persistState(['login']))
+const enhancer = compose(persistState(['login', 'mapConfig']))
 
 const store = createStore(rootReducer, undefined, enhancer)
 
diff --git a/frontend/src/styles.less b/frontend/src/styles.less
index b37df85..1952139 100644
--- a/frontend/src/styles.less
+++ b/frontend/src/styles.less
@@ -7,6 +7,7 @@
 
 @primaryColor: @obsColorB4;
 @secondaryColor: @obsColorG1;
+@borderColor: #E0E0E0;
 
 @menuHeight: 50px;