diff --git a/docs/user/editor/patterns.md b/docs/user/editor/patterns.md
index 401d595ca..8db1d82a4 100644
--- a/docs/user/editor/patterns.md
+++ b/docs/user/editor/patterns.md
@@ -84,6 +84,13 @@ Once you have adjusted the stop timings, another warning will appear prompting y
 
 ![normalize pattern stops](../../img/normalize-stop-times.png)
 
+#### Interpolation
+Datatools features two interpolation modes. 
+
+"Interpolate stop times between timepoints" ignores all non-timepoint pattern info. The timepoint timings are assumed to be in realation *to the previous timepoint*. 
+
+"Only update blank stop times" only updates blank stop times. Datatools will use shape data and non-blank stop times to calculate likely stoptimes. Stop times with values will be ignored.
+
 ### Calculate timings
 The average speed for the route can be used to calculate all the time gaps between stops in one go. A few parameters can be specified before calculating times:
 
@@ -101,6 +108,8 @@ Specific timings for each pattern stop can be set by either clicking on the stop
 - **Travel time:** the time it took to get from the previous station (should be 00:00 on the first stop of the sequence)
 - **Dwell time:** the time the vehicle rests at the stop
 
+###### When using timepoint interpolation, these timings are assumed to be in relation to the previous timepoint. Otherwise, they are assumed to be in relation to the previous stop.
+
 ### Tutorial Video: Editing/Creating Patterns
 The following video demonstrates how to create patterns as outlined above, in a step by step manner. 
 <iframe 
diff --git a/i18n/english.yml b/i18n/english.yml
index b34b9e679..c0fd7343a 100644
--- a/i18n/english.yml
+++ b/i18n/english.yml
@@ -804,11 +804,12 @@ components:
       substitutionInvalid: Some substitution patterns are invalid.
   NormalizeStopTimesModal:
     close: Close
-    interpolateStopTimes: Interpolate stop times between timepoints?
+    interpolateStopTimes: Interpolate stop times between timepoints (Ignore all travel/dwell times except for timepoints)
     normalizeStopTimes: Normalize stop times
     normalizeStopTimesQuestion: Normalize stop times?
     selectBeginningPatternStop: "Select beginning pattern stop:"
     tooFewTimepoints: "You must have more than 1 timepoint to interpolate times"
+    updateBlankOnly: Only update blank stop times
     usageExplanationOne: This feature is useful when the travel times for one or more
       pattern stops change. Take for example a pattern
       that has been re-routed along to travel a longer distance, has had a
@@ -817,10 +818,10 @@ components:
       you can normalize the stop times to bring them into alignment with the
       updated travel times reflected in the pattern stops.
     usageExplanationTwo: Interpolating stop times calculates the implicit speed between timepoints
-      based on the shape distance and the default travel times. This speed is
+      based on the shape distance and the default travel times of timepoints. This speed is
       then applied to the shape distance traveled for each intermediate non-timepoint
-      stop to provide interpolated travel times. The default travel time for non-timepoint
-      stops will not be modified.
+      stop to provide interpolated stop times. 
+      This feature ignores all travel/dwell times except for timepoints!
     usageNotes: " Usage notes"
   NormalizeStopTimesTip:
     info: "Tip: when changing travel times, consider
diff --git a/i18n/german.yml b/i18n/german.yml
index d4cbb009d..6e024b42d 100644
--- a/i18n/german.yml
+++ b/i18n/german.yml
@@ -823,6 +823,7 @@ components:
     normalizeStopTimesQuestion: Normalize stop times?
     selectBeginningPatternStop: "Select beginning pattern stop:"
     tooFewTimepoints: "You must have more than 1 timepoint to interpolate times"
+    updateBlankOnly: Only update blank stop times
     usageExplanationOne: This feature is useful when the travel times for one or more
       pattern stops change. Take for example a pattern
       that has been re-routed along to travel a longer distance, has had a
diff --git a/i18n/polish.yml b/i18n/polish.yml
index 4af684ab7..0b14e2d03 100644
--- a/i18n/polish.yml
+++ b/i18n/polish.yml
@@ -814,6 +814,7 @@ components:
     normalizeStopTimesQuestion: Normalize stop times?
     selectBeginningPatternStop: "Select beginning pattern stop:"
     tooFewTimepoints: "You must have more than 1 timepoint to interpolate times"
+    updateBlankOnly: Only update blank stop times
     usageExplanationOne: This feature is useful when the travel times for one or more
       pattern stops change. Take for example a pattern
       that has been re-routed along to travel a longer distance, has had a
diff --git a/lib/editor/actions/tripPattern.js b/lib/editor/actions/tripPattern.js
index fbafa8b6d..3ef3507f2 100644
--- a/lib/editor/actions/tripPattern.js
+++ b/lib/editor/actions/tripPattern.js
@@ -51,12 +51,12 @@ export type EditorTripPatternActions = ActionType<typeof normalizeStopTimes> |
  * provides a way to bulk update existing trips when pattern stops are modified
  * (e.g., a pattern stop is inserted, removed, or its travel times modified).
  */
-export function normalizeStopTimes (patternId: number, beginStopSequence: number, interpolateStopTimes: boolean) {
+export function normalizeStopTimes (patternId: number, beginStopSequence: number, interpolateStopTimes: boolean, ignoreNonBlank: boolean) {
   return function (dispatch: dispatchFn, getState: getStateFn) {
     const {data} = getState().editor
     const {feedSourceId} = data.active
     const sessionId = data.lock.sessionId || ''
-    const url = `/api/editor/secure/pattern/${patternId}/stop_times?feedId=${feedSourceId || ''}&sessionId=${sessionId}&stopSequence=${beginStopSequence}&interpolateStopTimes=${interpolateStopTimes.toString()}`
+    const url = `/api/editor/secure/pattern/${patternId}/stop_times?feedId=${feedSourceId || ''}&sessionId=${sessionId}&stopSequence=${beginStopSequence}&interpolateStopTimes=${interpolateStopTimes.toString()}&ignoreNonBlankStopTimes=${ignoreNonBlank.toString()}`
     return dispatch(secureFetch(url, 'put'))
       .then(res => res.json())
       .then(json => toast.info(`ⓘ ${json.updateResult}`, {
diff --git a/lib/editor/components/pattern/NormalizeStopTimesModal.js b/lib/editor/components/pattern/NormalizeStopTimesModal.js
index cb274a735..4e57fac6f 100644
--- a/lib/editor/components/pattern/NormalizeStopTimesModal.js
+++ b/lib/editor/components/pattern/NormalizeStopTimesModal.js
@@ -16,12 +16,13 @@ type Props = {
   stops: Array<GtfsStop>
 }
 
-type State = { interpolateStopTimes: boolean, patternStopIndex: number, show: boolean }
+type State = { ignoreNonBlank: boolean, interpolateStopTimes: boolean, patternStopIndex: number, show: boolean }
 
 export default class NormalizeStopTimesModal extends Component<Props, State> {
   messages = getComponentMessages('NormalizeStopTimesModal')
 
   state = {
+    ignoreNonBlank: false,
     interpolateStopTimes: false,
     patternStopIndex: 0, // default to zeroth pattern stop
     show: false
@@ -29,8 +30,9 @@ export default class NormalizeStopTimesModal extends Component<Props, State> {
 
   _onClickNormalize = () => {
     const { activePattern, normalizeStopTimes } = this.props
-    normalizeStopTimes(activePattern.id, this.state.patternStopIndex, this.state.interpolateStopTimes)
-    this.setState({interpolateStopTimes: false})
+    normalizeStopTimes(activePattern.id, this.state.patternStopIndex, this.state.interpolateStopTimes, this.state.ignoreNonBlank)
+    this.setState({interpolateStopTimes: false, ignoreNonBlank: false})
+    this.props.onClose()
   }
 
   _onChangeStop = (evt: SyntheticInputEvent<HTMLInputElement>) => {
@@ -38,7 +40,7 @@ export default class NormalizeStopTimesModal extends Component<Props, State> {
   }
 
   _onClose = () => {
-    this.setState({ show: false, interpolateStopTimes: false })
+    this.setState({ show: false, interpolateStopTimes: false, ignoreNonBlank: false })
     this.props.onClose()
   }
 
@@ -46,6 +48,10 @@ export default class NormalizeStopTimesModal extends Component<Props, State> {
     this.setState({interpolateStopTimes: !this.state.interpolateStopTimes})
   }
 
+  _onChangeNonBlank = () => {
+    this.setState({ignoreNonBlank: !this.state.ignoreNonBlank, interpolateStopTimes: false})
+  }
+
   render () {
     const { Body, Footer, Header, Title } = Modal
     const { activePattern, stops } = this.props
@@ -89,15 +95,24 @@ export default class NormalizeStopTimesModal extends Component<Props, State> {
             >
               <Checkbox
                 disabled={interpolationDisabled}
+                id='interpolate'
                 onChange={this._onChangeInterpolation}
                 value={this.state.interpolateStopTimes}
               />
             </OverlayTrigger>
             {/* Separate label so that tooltip appears over checkbox. Hack: Padding to align center with checkbox */}
-            <span style={{paddingBottom: '2px'}}>{this.messages('interpolateStopTimes')}</span>
+            <label htmlFor='interpolate' style={{fontWeight: 'normal', paddingBottom: '2px'}}>{this.messages('interpolateStopTimes')}</label>
+          </div>
+          <div style={{alignContent: 'center', alignItems: 'center', display: 'flex', marginTop: -20, marginBottom: -20}}>
+            <Checkbox
+              id='ignoreNonBlank'
+              onChange={this._onChangeNonBlank}
+              value={this.state.ignoreNonBlank}
+            />
+            <label htmlFor='ignoreNonBlank' style={{fontWeight: 'normal', paddingBottom: '2px'}}>{this.messages('updateBlankOnly')}</label>
           </div>
           <br />
-          <Alert bsStyle='warning'>
+          {!this.state.ignoreNonBlank && <Alert bsStyle='warning'>
             {this.state.patternStopIndex === 0
               // TODO: figure out how yml messages with html tags can be rendered
               // correctly.
@@ -111,7 +126,7 @@ export default class NormalizeStopTimesModal extends Component<Props, State> {
                 prior will be unmodified).
               </span>
             }
-          </Alert>
+          </Alert>}
           <Alert bsStyle='info'>
             <h5><Icon type='info-circle' />{this.messages('usageNotes')}</h5>
             <small>