The section at Portage la Prairie is also known as Saskatchewan Avenue and like most alternate spurs, it was the old route of PTH 1 until its current alignment was built. The highway is an alternate route that goes through Portage la Prairie. The highway in Portage la Prairie is westbound and eastbound. The speed limit is within city limits unless otherwise posted, becoming on both sides approaching PTH 1. The highway received its current designation after the Portage la Prairie bypass was completed and opened to traffic in 1970.
Brandon section
This section serves Manitoba's second largest city, Brandon. As noted in the Portage la Prairie section, this was the original route for PTH 1 through Brandon prior to 1959. PTH 1A is known as 1st Street north-south and Victoria Avenue east-west inside the city limits, and maintains an east-west designation for the entire route. The route is often used by trucks and buses to Brandon, as well as commuters and tourists and campers. The speed limit is mostly in the suburban area, and in the rural areas. The length of the highway is. Large trucks travelling eastbound are not permitted to travel on the rural section of PTH 1A between Brandon and the Trans-Canada Highway near Kemnay due to a very low Canadian Pacific Railway bridge which passes over the highway just east of the small community; oversized trucks travelling westbound are rerouted on to a gravel road connecting PTH 1A and the Trans-Canada Highway less than east of the underpass. Not only is the height of the bridge over the highway substandard, there is no shoulder on either side of the highway. These factors make for a very tight entry into this area for both eastbound and westbound motorists. Despite the efforts of the Manitoba government to prevent oversized trucks from attempting to travel under this bridge, there are still numerous incidents of trucks either crashing into the bridge or getting stuck in the opening, causing extended closures of the route. Eastbound traffic on the Trans-Canada Highway encounters a sign advising vehicles above the 3.7m limit requiring access to Brandon to continue traveling on PTH 1 approximately before the junction. The highway received its current designation when PTH 1 was configured around Brandon in 1959.
