September 16, 2014

This webpage contains a database developed from field testing of roads in the City of London, and South-Western Ontario. It is meant as a tool to allow the comparison of the tested roads with respect to the “good” or “bad” effects on the motion of a passenger car. The primary values used for the comparison are the lateral and longitudinal rotations of the vehicle caused by its interaction with the road surface. The columns “Lateral Motion” and “Longitudinal Motion” contain the standard deviations of the rotations of the vehicle over the tested road segment.  Further details regarding the meaning and interpretation of the data can be obtained from reviewing the accompanying website article on the Articles webpage of this ( website entitled “Guidelines For Interpretation of Gorski Consulting Road Data From iPhone Testing – March 2014 Version”. The current datafiles reflect testing that has been completed up to July 21, 2019.

Three additional datafiles have been included. Two of the new files are entitled “Bridge Junction & Railway Track Data” and “Incomplete Road Repair Data”. As suggested by the titles these files contain data from driving our test vehicle over those features. Unlike most of the road data, these road features exist over very short distances therefore the displayed data capture is provided for a time of only 2 seconds. It should be obvious that data displayed beyond those 2 seconds would be rather meaningless because the vehicle’s vibration would no longer exist and would not provide a meaningful demonstration of the feature’s effect on the vehicle.

A third file entitled “Bicycle Lateral & Longitudinal Rotations – Summary Table” has been included so that the motions of our passenger vehicle can be compared to the motions of a standard, hybrid, 21-speed bicycle that was run along a paved shoulder.

To find the roadway (or feature) of interest simply click on the link relating to the geographical location of the site and then scroll down the list of roadways until you locate the roadway segment of interest. Note that roadways are listed with respect to their geographical location rather than with respect to the government agency responsible for its maintenance. Thus portions of Highway 401 are listed under “City of London” because some portions of that highway are located with the City’s boundaries even though its maintenance is the responsibility of the Ontario Ministry of Transportation.

January 4, 2015: Data has been added for Eastbound Oxford County Road 18 (Norwich Road) From Highway 19 to Middletown Line. Westbound data will also be added shortly.

November 10, 2016: Data has been added for Wonderland Road south of Highway 401 in Middlesex County.

November 11, 2017: Data has been added from Medway Road between Hyde Park Road and Vanneck Road in Middlesex County.

July 28, 2019: Data has been added from testing on the Lincoln Alexander and Red Hill Valley Parkways in Hamilton, Ontario.

July 28, 2019: Data has been added from testing on Highways 401 and 402 in South-Western Ontario.

December 26, 2019: Data has been added from testing on Sunningdale Road in London, Ontario, on February 27, 2015 and July 21, 2019.

January 2, 2020: Data has been added from testing on Clarke Road, Veterans Memorial Parkway and Highway 401 in London, Ontario from testing that was conducted on July 21, 2019.


(Click on a link to search for road segment)

City of London

City of Hamilton

Elgin County

Middlesex County

Lambton County

Oxford County

Ontario 400 Series Highways

Incomplete Road Repairs – City of London

Bridge Junction & Railway Track Data – Various Jurisdications

Bicycle Lateral & Longitudinal Rotations – Summary Table

(Additions Will Be Made As New Testing Is Completed)