This template's initial visibility currently defaults to expanded, meaning that it is fully visible.
To change this template's initial visibility, the |state=parameter may be used:
{{Ontario Provincial Highways|state=collapsed}} will show the template collapsed, i.e. hidden apart from its title bar.
{{Ontario Provincial Highways|state=autocollapse}} will show the template autocollapsed, i.e. if there is another collapsible item on the page (a navbox, sidebar, or table with the collapsible attribute), it is hidden apart from its title bar, but if not, it is fully visible.
Expand primary/king/400 highways section
Set |king=, |400= or |primary= to any value to expand the king's highway section.
Expand secondary highways section
Set |secondary= to any value to expand the secondary highway section
Expand tertiary highways section
Set |tertiary= to any value to expand the tertiary highway section
Expand 7000 series highways section
Set |7000= to any value to expand the 7000 series highway section
Template documentation