THE sidewalk lanes for the digitally distracted may be a joke, but officials in Philadelphia want the public to know the issue is no laughing matter.

Lines on some sidewalks near City Hall now designate part of the pavement as “e-lanes” suitable for chronic texters and digital music aficionados — although only through the end of that week.

The April Fool’s Day prank is one way city officials, in particular Mayor Michael Nutter, are trying to draw attention to the danger of inattentive pedestrians.

The lines, signage and sidewalk graphics — depicting a pedestrian peering down at a hand-held device — were to stick around part of John F. Kennedy Boulevard through the week of April 1-7, 2012.

A bogus video released for the new lanes shows Nutter being cut off mid-interview by an oblivious pedestrian, played by Streets Department Deputy Commissioner Steven Buckley.

“Sidewalk safety is important,” Nutter noted just after his mock interview was disrupted. The video also features a rowdy band of anti-texting protesters.

All kidding aside, officials said distracted pedestrians are a serious issue the city plans to address.