at the south end of the city, for many years wonderland road ended at highway 135, later exeter road. the section between southdale road and highway 135 was widened to four lanes in 1982 by middlesex county, and the city of london widened the road north of southdale to viscount road in the late 1980s. in 1997, a southerly extension joined wonderland road with 4.62 km of bostwick road, which also crossed highway 402. an interchange was constructed at highway 402 at the same time. wonderland road was separated by highway 401 from the southernmost section to the elgin county line, until 2015.