Tesla CEO Elon Musk announced via Twitter that the company plans to unveil an electric semi-truck this September.

According to a Teslarati report, Musk had “previously spoken about a semi-truck that would be far better than anything on the road, and by reading into the statement one can presume that the next level he’s referring to is Level 4 or Level 5 autonomy.”

Musk also tweeted that the commercial truck will be followed by a pickup truck for the consumer market within 18-24 months.