Related Clues:

• Like rush-hour traffic, ironically
• Moving at low speed
• School zone sign word
• Beatles "___ down, baby, now you're movin' way too fast"
• Small and close to the ground -- like a tortoise?
• Like tortoises
• Like a turtle
• Sign word near schools
• Like snail mail, vis-a-vis email
• Glacial in movement
• Like dial-up internet access, almost certainly
• Dull son's depression
• Hardly hopping
• A little dense
• Like off-season business