Highlight a particular road/railway line on Google Maps without specifying source and destinations

On Google Maps we usually look for a route between two places by specifying them by names. But how to highlight a route without specifying any place names? For example, if I enter Tokyo and Osaka in source and destination boxes on Maps it can show the main route and any alternate routes between the two cities. But what if I want to highlight only a road lets say if I want to look for Pacific Highway in Australia, the suggestions shown to me are of cities and if I click on one of them the Maps takes me to that spot on the map. But I want to highlight the whole of Pacific Highway and not any specific spot on the highway. Is there a way to do that in Google Maps?
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Can you highlight a route on Google Maps?
Google Maps will highlight the quickest route for you in blue, but you can always change your route by selecting one of the grey alternative routes, or clicking and dragging the route to customize it. You can change your route on Google Maps on the desktop version or the mobile app.How do I select a specific road in Google Maps?
After you enter a location and Google provides a route for you, click anywhere on the blue path to set a point. Drag that point to a new location to change the route. When you do this, other suggested alternate routes disappear from the map, and the driving directions change.How do I manipulate a route on Google Maps?
Customize your routeHow do I highlight a route in Google Earth?
Draw a path or polygonHow to highlight an area (City, State or Country) in Google Maps with JavaScript
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Images: Kelly L, Kieren Ridley, Ave Calvar Martinez, Elena Saharova