A spike in Minnesota motorcycle deaths is prompting safety officials to urge motorcycle riders and other drivers to share the road. The Department of Public Safety says that 13 motorcycle riders have died in Minnesota so far this year. That compares with five at this time last year. Nearly half of all motorcycle crashes this year involved another vehicle, and the most common factors in such crashes were inattention and failure to yield the right-of-way. A new campaign is kicking off this week to encourage motorists to look twice for motorcyclists, and includes a new TV spot. The campaign also revives the “Start Seeing Motorcyclists” slogan.