This was the case in mainstream media coverage of a road blockade near Halifax this week. The issue led to heated public debates, online and off, as to the existence of racism in the province. But no mainstream media outlet included an interactive map in their coverage — and the debates occurred without important context.

Protesters from the predominately black community of North Preston had blockaded a road after 10 white families were given preferential access to a private gravel side road. The side road was a shortcut to avoid a detour other residents were forced to make, following a maintenance-related bridge closure near the community. (See the map I’ve authored at right.)

Some protesters claimed racism was a factor in the decision. A municipal councillor initially said the 10 families were granted keys to a padlocked gate because they were the ones most affected by the bridge closure.

The story quickly re-ignited longstanding passions among Nova Scotians concerning the treatment of blacks in the province (see this Globe and Mail story for context). The headline on the National Post story cited allegations Nova Scotia is the “‘Mississippi of the North.” CBC Nova Scotia received 203 comments on its original story and 135 comments on the follow-up, many disparaging the black community for the allegations. CBC Radio Nova Scotia interviewed three former politicians this morning as to whether the lack of representation of African-Nova Scotians in municipal government contributed to the communication breakdown between the two communities. (Disclosure: my wife produced the item).

• Which residents were most inconvenienced by the bridge closure?
• How far were the 10 homes from others, whose residents would have to take the full detour?
• How distinct were these 10 homes?
• How much distance was saved by the shortcut?

These facts were not clear in most media reports.

Seemingly out of frustration with the lack of context, CBC.ca commenters “CanadaGirl47″ and “chief wiggam” made pleas for someone to post a map to better explain the situation. Users themselves answered by providing their own maps to explain their positions. Commenter “kjasant” posted a screenshot of this map and commenter “ItsJustNotFair” linked to this one. On the Globe’s site, user “Tilgore Krout” provided 5-step instructions to view the side road in Google Maps.

An encouraging example of user engagement with the news? Perhaps.

But also a good reminder of how online maps can offer more information than text and, in this instance, can help readers better understand competing perspectives on an issue.

Colour-coded lines show traffic congestion in Google Maps for Mobile.

“It’s stop and go on the bridge.” “Watch out for that deer on the 102.”

The voices are a staple of local radio — listeners calling in to report traffic conditions. On-air updates build audiences, involve listeners and bring advertisers to morning and afternoon shows.

But Google believes it can deliver traffic reports faster and with more accuracy by harnessing the power of mobile users.

Google announced today it was bringing the power of crowd-sourced data to its Traffic layer in Google Maps, currently available only in the U.S.

Users of Google Maps for Mobile have to allow Google to see their location first. But when they do, they contribute traffic data anonymously and effortlessly as they travel. Their GPS-enabled mobile phone contributes their location and aggregates it with others to form a live picture of traffic in the area. Its announcement states:

When we combine your speed with the speed of other phones on the road, across thousands of phones moving around a city at any given time, we can get a pretty good picture of live traffic conditions. We continuously combine this data and send it back to you for free in the Google Maps traffic layers.

Google also announced it was expanding its Traffic layer to cover all U.S. highways and arterial roads.

Google has the leading mobile map app. While it’s competing with standalone GPS providers such as TomTom and Garmin in providing driving assistance, the division between smartphones and standalone devices is already starting to fall. TomTom released its turn-by-turn maps as an iPhone app 10 days ago — the first company to do so.

Google’s move is yet another grab at services traditionally provided by news media — services that bring revenues to support local newsrooms. While newspapers have had their audiences slashed by aggregators of news and classified listings, radio has remained relatively unscathed by advances in online technology.

The move puts radio producers on notice that they too need to find other ways of strengthening listener interaction.