March 27, 2022

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 May 25, 2021.

It needs to be emphasized that the reporting of this road data is not meant to be a full (or even a minimal) explanation of the complex interaction between a vehicle and the road on which in travels. There has been no attempt here to discuss the very technical aspects of this relationship. We simply make note that this testing procedure can be used to distinguish between road characteristics that are “bad’ or “good” as these characteristics may influence whether a vehicle may be involved in a collision. A detailed treatise of this relationship can be obtained from reading source materials such as the book “Fundamentals of Vehicle Dynamics”, 1992, authored by Thomas D. Gillespie.

Additional datafiles have been uploaded showing the results from testing on specific road features. For example “Bridge Junction & Railway Track Data”, “Incomplete Road Repair Data” and “Speed Bump Testing” show results from driving over these features. Unlike most of the road data, these road features exist over very short distances therefore the displayed data 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 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 boundries 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.

October 23, 2016: Data has been added from testing on Wonderland Road between Hwy 401 and Ferguson Line in Middlesex and Elgin Counties.

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.

June 2, 2018: Data has been added from testing along Veterans Memorial Parkway from Trafalgar Street to Hwy 401 in London, Ontario.

April 29, 2019: Data was added from testing on Hwy 402 between Centre Road in Strathroy and Miller Road on the west outskirts of London, Ontario.

May 15 and June 16, 2019: Data has been added from testing on Hamilton’s Lincoln Alexander Expressway and Red Hill Valley Parkway.

May 15, 2019: Data was added from testing on Hwy 403 between the Lincoln Alexander Expressway in Hamilton and Hwy 401 at Woodstock, Ontario.

May 15-19: Data has been added from testing on Hwy 401 Between Hwy 403 at Woodstock to Highbury Ave in London, Ontario.

July 21, 2019: Data has been added from testing on Sunningdale Road between Clarke Road and Highbury Ave in London, Ontario.

July 21, 2019: Data has been added from testing on Veterans Memorial Parkway from Huron Street to Hwy 401 in London, Ontario.

May 15 and October 23, 2019: Data has been added from testing on Highbury Ave between Hamilton Road and Hwy 401, in London, Ontario

March 4, 25 and 26, 2021: Data was added from testing with two school buses (one full-size & one 18-passenger) along White Oak Road, Southdale Road, Wellington Road, Commissioners Road, Wharncliffe Road, Pack Road, Bostwick Road, Exeter Road, and Wonderland Road, all in London, Ontario.

May 11, May 18 and May 25, 2021: Data has been added from driving an 18-Passenger school bus over speed bumps on Cranbrook, Vicount and Farmham Road, Edmonton Street and on Wilson Street, all in London, Ontario.


(Click on a link to search for road segment)

Road Conditions Data – City of London

Road Conditions Data – Elgin County

Road Conditions Data – Middlesex County

Road Conditions Data – Lambton County

Road Conditions Data – Oxford County

Incomplete Road Repair Data – City of London

Bridge Junction & Railway Track Data – Various Jurisdictions

Bicycle Lateral & Longitudinal Rotations – Summary Table

Speed Bump Testing – City of London

School Bus Testing

(Additions Will Be Made As New Testing Is Completed)